Circuit/System Testing

Test 1

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector:S79D Window Switch - Driver
3. Test for less than 10 ohms between the test points:Ground circuit terminal 1 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points:Ground circuit terminal 1 @Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Ignition - On / Vehicle - In Service Mode
5. Verify a test lamp turns On between the test points: B+ circuit terminal 4 & Ground
   • If the test lamp does not turn On and the circuit fuse is OK 
   1. Ignition/Vehicle - Off & Remove - Test lamp
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
   • If the test lamp does not turn On and the circuit fuse is open 
   1. Ignition/Vehicle - Off & Remove - Test lamp
   2. Test for infinite resistance between the test points:B+ circuit terminal 4 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:S79D Window Switch - Driver
   • Go to next step: If the test lamp turns On 
6. Verify the scan tool parameter:Driver Window Main Control Down Switch=Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector:M74D Window Motor - Driver
   3. Test for infinite resistance between the test points:Signal circuit terminal 3 @Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:M74D Window Motor - Driver
   • Go to next step: If the specified state 
7. Momentarily connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & Ground circuit terminal 1

   Verify the scan tool parameter:Driver Window Main Control Down Switch=Active

   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector:M74D Window Motor - Driver
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points:Signal circuit terminal 3 @Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for less than 2 ohms between the test points:Signal circuit terminal 7 @Component harness & Signal circuit terminal 3 @M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M74D Window Motor - Driver
   • Go to next step: If the specified state 
8. Verify the scan tool parameter:Driver Window Main Control Up Switch=Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector:M74D Window Motor - Driver
   3. Test for infinite resistance between the test points:Signal circuit terminal 6 @Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:M74D Window Motor - Driver
   • Go to next step: If the specified state 
9. Momentarily connect a 3 A fused jumper wire between the test points:Signal circuit terminal 6 & Ground circuit terminal 1

   Verify the scan tool parameter:Driver Window Main Control Up Switch=Active

   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector:M74D Window Motor - Driver
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points:Signal circuit terminal 6 @Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for less than 2 ohms between the test points:Signal circuit terminal 6 @Component harness & Signal circuit terminal 3 @M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M74D Window Motor - Driver
   • Go to next step: If the specified state 
10. Test for greater than 10 V between the test points:Signal circuit terminal 5 @Component harness & Ground
    • If 10 V or less 
    1. Disconnect the electrical connector:M74D Window Motor - Driver
    2. Test for infinite resistance between the test points:Signal circuit terminal 5 @Component harness & Ground
       • If less than infinite resistance - Repair the short to ground on the circuit.
       • If infinite resistance
    3. Test for less than 2 ohms between the test points:Signal circuit terminal 5 @Component harness & Terminal 5 @M74D Window Motor - Driver
       • If 2 ohms or greater - Repair the open/high resistance in the circuit.
       • If less than 2 ohms - Replace the component:M74D Window Motor - Driver
    • If greater than 10 V 
11. Test or replace the component:S79D Window Switch - Driver

Test 2

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector:S79P Window Switch - Passenger
3. Test for less than 10 ohms between the test points:
   • { Without A45 }Ground circuit terminal 1 & Ground
   • { With A45 }Ground circuit terminal 13 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points:
      • { Without A45 }Ground circuit terminal 1 @Component harness & Ground Connection
      • { With A45 }Ground circuit terminal 13 @Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Ignition - On / Vehicle - In Service Mode
5. Verify the scan tool parameter:Passenger Window Switch at Door=Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector:M74P Window Motor - Passenger
   3. Test for infinite resistance between the test points:
      • { With A45 }Signal circuit terminal 15 @Component harness & Ground
      • { With A45 }Signal circuit terminal 18 @Component harness & Ground
      • { Without A45 }Signal circuit terminal 6 @Component harness & Ground
      • { Without A45 }Signal circuit terminal 3 @Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:M74P Window Motor - Passenger
   • Go to next step: If the specified state 
6. Momentarily connect a 3 A fused jumper wire between the test points:
   • { With A45 }Signal circuit terminal 18 @Component harness & Ground
   • { Without A45 }Signal circuit terminal 6 @Component harness & Ground
7. Verify the scan tool parameter:Passenger Window Switch at Door=Up
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector:M74P Window Motor - Passenger
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points:
      • { With A45 }Signal circuit terminal 18 @Component harness & Ground
      • { Without A45 }Signal circuit terminal 6 @Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for less than 2 ohms between the test points:
      • { With A45 }Signal circuit terminal 18 @Component harness & Signal circuit terminal 3 @M74P Window Motor - Passenger
      • { Without A45 }Signal circuit terminal 6 @Component harness & Signal circuit terminal 3 @M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M74P Window Motor - Passenger
   • Go to next step: If the specified state 
8. Momentarily connect a 3 A fused jumper wire between the test points:
   • { With A45 }Signal circuit terminal 15 @Component harness & Ground
   • { Without A45 }Signal circuit terminal 3 @Component harness & Ground
9. Verify the scan tool parameter:Passenger Window Switch at Door=Down
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector:M74P Window Motor - Passenger
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points:
      • { With A45 }Signal circuit terminal 15 @Component harness & Ground
      • { Without A45 }Signal circuit terminal 3 @Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for less than 2 ohms between the test points:
      • { With A45 }Signal circuit terminal 15 @Component harness & Signal circuit terminal 7 @M74P Window Motor - Passenger
      • { Without A45 }Signal circuit terminal 3 @Component harness & Signal circuit terminal 7 @M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M74P Window Motor - Passenger
   • Go to next step: If the specified state 
10. Test for greater than 10 V between the test points:
    • { With A45 }Signal circuit terminal 14 @Component harness & Ground
    • { Without A45 }Signal circuit terminal 2 @Component harness & Ground
    • If 10 V or less 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:M74P Window Motor - Passenger
    3. Test for infinite resistance between the test points:
       • { With A45 }Signal circuit terminal 14 @Component harness & Ground
       • { Without A45 }Signal circuit terminal 2 @Component harness & Ground
       • If less than infinite resistance - Repair the short to ground on the circuit.
       • If less than infinite resistance
    4. Test for less than 2 ohms between the test points:
       • { With A45 }Signal circuit terminal 14 @Component harness & Signal circuit terminal 5 @ M74P Window Motor - Passenger
       • { Without A45 }Signal circuit terminal 2 @Component harness & Signal circuit terminal 5 @ M74P Window Motor - Passenger
         • If 2 ohms or greater - Repair the open/high resistance in the circuit.
         • If less than 2 ohms - Replace the component: M74P Window Motor - Passenger
    • Go to next step: If the specified state 
11. Test or replace the component:S79P Window Switch - Passenger

Test 3

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector:S79LR Window Switch - Left Rear
3. Test for less than 10 ohms between the test points:Ground circuit terminal 5 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points:Ground circuit terminal 5 @Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Ignition - On / Vehicle - In Service Mode
5. Verify a test lamp turns On between the test points: B+ circuit terminal 8 & Ground
   • If the test lamp does not turn On and the circuit fuse is OK 
   1. Ignition/Vehicle - Off & Remove - Test lamp
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
   • If the test lamp does not turn On and the circuit fuse is open 
   1. Ignition/Vehicle - Off & Remove - Test lamp
   2. Test for infinite resistance between the test points:B+ circuit terminal 1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:S79LR Window Switch - Left Rear
   • Go to next step: If the test lamp turns On 
6. Ignition/Vehicle - Off
7. Connect the electrical connector.S79LR Window Switch - Left Rear
8. Disconnect the electrical connector:M74LR Window Motor - Left Rear
9. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
10. Ignition - On / Vehicle - In Service Mode
11. Perform the scan tool control function:Left Rear Window Motor

    Verify the test lamp state:

    Left Rear Window Motor - Stop=Test lamp Off

    Left Rear Window Motor - Up=Test lamp On

    Left Rear Window Motor - Down=Test lamp On

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: S79LR Window Switch - Left Rear
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
       • Control circuit terminal 1 @Component harness & Ground
       • Control circuit terminal 2 @Component harness & Ground
       • If 1 V or greater - Repair the short to voltage on the circuit.
       • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points:
       • Control circuit terminal 1 @Component harness & Ground
       • Control circuit terminal 2 @Component harness & Ground
       • If less than infinite resistance - Repair the short to ground on the circuit.
       • If infinite resistance
    7. Test for less than 2 ohms between the test points:
       • Control circuit terminal 1 @Component harness & Control circuit terminal 6 @ S79LR Window Switch - Left Rear
       • Control circuit terminal 2 @Component harness & Control circuit terminal 7 @ S79LR Window Switch - Left Rear
         • If 2 ohms or greater - Repair the open/high resistance in the circuit.
         • If less than 2 ohms - Replace the component: S79LR Window Switch - Left Rear
    • Go to next step: If the specified state 
12. Test or replace the component: M74LR Window Motor - Left Rear

Test 4

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector:S79RR Window Switch - Right Rear
3. Test for less than 10 ohms between the test points:Ground circuit terminal 5 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points:Ground circuit terminal 5 @Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Ignition - On / Vehicle - In Service Mode
5. Verify a test lamp turns On between the test points: B+ circuit terminal 8 & Ground
   • If the test lamp does not turn On and the circuit fuse is OK 
   1. Ignition/Vehicle - Off & Remove - Test lamp
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
   • If the test lamp does not turn On and the circuit fuse is open 
   1. Ignition/Vehicle - Off & Remove - Test lamp
   2. Test for infinite resistance between the test points:B+ circuit terminal 8 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:S79RR Window Switch - Right Rear
   • Go to next step: If the test lamp turns On 
6. Ignition/Vehicle - Off
7. Connect the electrical connector.S79RR Window Switch - Right Rear
8. Disconnect the electrical connector:M74RR Window Motor - Right Rear
9. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
10. Ignition - On / Vehicle - In Service Mode
11. Perform the scan tool control function:Right Rear Window Motor

    Verify the test lamp state:

    Right Rear Window Motor - Stop=Test lamp Off

    Right Rear Window Motor - Up=Test lamp On

    Right Rear Window Motor - Down=Test lamp On

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: S79RR Window Switch - Right Rear
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
       • Control circuit terminal 1 @Component harness & Ground
       • Control circuit terminal 2 @Component harness & Ground
       • If 1 V or greater - Repair the short to voltage on the circuit.
       • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points:
       • Control circuit terminal 1 @Component harness & Ground
       • Control circuit terminal 2 @Component harness & Ground
       • If less than infinite resistance - Repair the short to ground on the circuit.
       • If infinite resistance
    7. Test for less than 2 ohms between the test points:
       • Control circuit terminal 1 @Component harness & Control circuit terminal 6 @ S79RR Window Switch - Right Rear
       • Control circuit terminal 2 @Component harness & Control circuit terminal 7 @ S79RR Window Switch - Right Rear
         • If 2 ohms or greater - Repair the open/high resistance in the circuit.
         • If less than 2 ohms - Replace the component: S79RR Window Switch - Right Rear
    • Go to next step: If the specified state 
12. Test or replace the component: M74RR Window Motor - Right Rear