Circuit/System Testing

S70F Steering Wheel Controls Switch - Radio Volume

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70F Steering Wheel Controls Switch - Radio Volume. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 Ω 
3. Ignition ON.
4. Test for greater than 4.5 V between the signal circuit terminals listed below and ground:
   • Terminal 1
   • Terminal 2
   • If 4.5 V or less 
   1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
   2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S70R Steering Wheel Controls Switch - Right.
   • Go to next step: If greater than 4.5 V 
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3.
6. Verify the scan tool Steering Wheel Control Switches parameter is Volume Down Button.
   • If not Volume Down Button 

     Test or replace the S70R Steering Wheel Controls Switch - Right.

   • Go to next step: If Volume Down Button 
7. Remove the jumper wire. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.
8. Verify the scan tool Steering Wheel Control Switches parameter is Volume Up Button.
   • If not Volume Up Button 

     Test or replace the S70R Steering Wheel Controls Switch - Right.

   • Go to next step: If Volume Up Button 
9. Test or replace the S70F Steering Wheel Controls Switch - Radio Volume.

S70E Steering Wheel Controls Switch - Radio Presets

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70E Steering Wheel Controls Switch - Radio Presets. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 Ω 
3. Ignition ON.
4. Test for greater than 4.5 V between the signal circuit terminals listed below and ground:
   • Terminal 1
   • Terminal 2
   • If 4.5 V or less 
   1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
   2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S70R Steering Wheel Controls Switch - Right.
   • Go to next step: If greater than 4.5 V 
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3.
6. Verify the scan tool Steering Wheel Control Switches parameter is Next Preset.
   • If not Next Preset 

     Test or replace the S70R Steering Wheel Controls Switch - Right.

   • Go to next step: If Next Preset 
7. Remove the jumper wire. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.
8. Verify the scan tool Steering Wheel Control Switches parameter is Previous Preset.
   • If not Previous Preset 

     Test or replace the S70R Steering Wheel Controls Switch - Right.

   • Go to next step: If Previous Preset 
9. Test or replace the S70E Steering Wheel Controls Switch - Radio Presets.

S70R Steering Wheel Controls Switch-Right

1. Ignition OFF, disconnect the harness connector X1 at the P16 Instrument Cluster.
2. Disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right. Ignition ON.
3. Test for less than 1 V between the S70R Steering Wheel Controls Switch - Right serial data circuit terminal 2 and ground.
   • If greater than 1 V 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
4. Ignition OFF.
5. Test for infinite resistance between the serial data circuit terminal 2 and ground.
   • If less than infinite resistance 

     Repair the short to ground on the circuit.

   • Go to next step: If infinite resistance 
6. Replace the S70R Steering Wheel Controls Switch - Right.