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HOMESERVICE MANUALSCHEVROLET2019EXPRESS 2500 BASE, VAN CARGO EXTENDED, 6.0L ENG VIN GREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (FIXED AND MOVEABLE WINDOW SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER WINDOWS MALFUNCTIONCIRCUIT/SYSTEM TESTING

2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN G

Circuit/System Testing

2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN GSECTION Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Savana 3500, 2018 GMC Savana 2500, 2018 Chevrolet Express 3500, and 2018 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

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.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: S79D Window Switch - Driver
Test for less than 10 ohms between the test points: Ground circuit terminal F & Ground
- If 10 ohms or greater
1. Ground Connection - Disconnect
2. Test for less than 2 ohms between the test points: Ground circuit terminal F@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
Ignition - On / Vehicle - In Service Mode
Verify a test lamp turns On between the test points: Ignition circuit terminal C & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for less than 2 ohms between the test points: Ignition circuit terminal C & Output terminal @ CB2PA Fuse
  - 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: Ignition circuit terminal C & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for infinite resistance between the test points:
  - Control circuit terminal A & Ground
  - Control circuit terminal D & Ground
  - Control circuit terminal G & Ground
  - Control circuit terminal H & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Test or replace the component: S79D Window Switch - Driver
- Go to next step: If the test lamp turns On
Ignition/Vehicle - Off
Connect the electrical connector: S79D Window Switch - Driver
Disconnect the electrical connector: M74D Window Motor - Driver
Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
Ignition - On / Vehicle - In Service Mode
Operate the component: Driver Left Front Window Switch
Verify the test lamp state:
- Not Pressed = Test lamp Off
- Pulled - Up = Test lamp On
- Pressed - Down = Test lamp On
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector: S79D Window Switch - Driver
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.
  - Go to next step: 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.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points:
  - Control circuit terminal 1@ Component harness & Terminal H @ S79D Window Switch - Driver
  - Control circuit terminal 2 @ Component harness & Terminal G @ S79D Window Switch - Driver
    - If 2 ohms or greater - Repair the open/high resistance in the circuit.
    - If less than 2 ohms - Replace the component: S79D Window Switch - Driver
- Go to next step: If the specified state
Test or replace the component: M74D Window Motor - Driver

Test 2

Ignition/Vehicle - Off
Disconnect the electrical connector: S79P Window Switch - Passenger
Connect a test lamp between the test points: Control circuit terminal D & Control circuit terminal H
Ignition - On / Vehicle - In Service Mode
Operate the component: S79D Window Switch - Driver - Right Front Window Switch
Verify the test lamp state:
- Not Pressed = Test lamp Off
- Pulled - Up = Test lamp On
- Pressed - Down = Test lamp On
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector: S79D Window Switch - Driver
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points:
  - Control circuit terminal D @ Component harness & Ground
  - Control circuit terminal H @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
5. Ignition/Vehicle - Off
6. Test for infinite resistance between the test points:
  - Control circuit terminal D @ Component harness & Ground
  - Control circuit terminal H @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points:
  - Control circuit terminal D @ Component harness & Terminal D @ S79D Window Switch - Driver
  - Control circuit terminal H @ Component harness & Terminal A @ S79D Window Switch - Driver
    - If 2 ohms or greater - Repair the open/high resistance in the circuit.
    - If less than 2 ohms - Replace the component: S79D Window Switch - Driver
Ignition/Vehicle - Off
Connect the electrical connector:S79P Window Switch - Passenger
Disconnect the electrical connector: M74P Window Motor - Passenger
Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
Ignition - On / Vehicle - In Service Mode
Operate the component: S79P Window Switch - Passenger
Verify the test lamp state:
- Not Pressed = Test lamp Off
- Pulled - Up = Test lamp On
- Pressed - Down = Test lamp On
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector: S79P Window Switch - Passenger
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.
  - Go to next step: 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.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points:
  - Control circuit terminal 1 @ Component harness & Terminal G @ S79P Window Switch - Passenger
  - Control circuit terminal 2 @ Component harness & Terminal F @ S79P Window Switch - Passenger
    - If 2 ohms or greater - Repair the open/high resistance in the circuit.
    - If less than 2 ohms - Replace the component: S79P Window Switch - Passenger
- Go to next step: If the specified state
Test or replace the component: M74P Window Motor - Passenger

Test 3

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector:S79P Window Switch - Passenger
Ignition - On / Vehicle - In Service Mode
Verify a test lamp turns On between the test points: Ignition circuit terminal A & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for less than 2 ohms between the test points: Ignition circuit terminal A & Output terminal @ CB2PA Fuse
  - 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.
- Go to next step: If the test lamp turns On
Test or replace the component: S79P Window Switch - Passenger

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.