Circuit/System Testing

S70E Steering Wheel Controls Switch - Radio Presets

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: S70E Steering Wheel Controls Switch - Radio Presets
3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
   • If 10 ohms or greater 
   1. Disconnect the concerned ground connection.
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 1 @ Component harness & The other end of the circuit @ Ground terminal
      • 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: Steering Wheel Control Switches = Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
   3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ S70E Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   4. Test for infinite resistance between the test points: Signal circuit terminal 3 @ S70E Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: S70R Steering Wheel Controls Switch - Right
   • Go to next step: If the specified state 
6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground circuit terminal 3 @ S70E Component harness
7. Verify the scan tool parameter: Steering Wheel Control Switches = Previous Preset
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
   3. Ignition - On/Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ S70E 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 less than 2 ohms between the test points: Signal circuit terminal 2 @ S70E Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S70R Steering Wheel Controls Switch - Right
   • Go to next step: If the specified state 
8. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Ground circuit terminal 3 @ S70E Component harness
9. Verify the scan tool parameter: Steering Wheel Control Switches = Next Preset
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
   3. Ignition - On/Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ S70E 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 less than 2 ohms between the test points: Signal circuit terminal 3 @ S70E Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S70R Steering Wheel Controls Switch - Right
   • Go to next step: If the specified state 
10. Test or replace the component: S70E Steering Wheel Controls Switch - Radio Presets

S70F Steering Wheel Controls Switch - Radio Volume

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: S70F Steering Wheel Controls Switch - Radio Volume
3. Test for less than 10 ohms between the test points: Ground circuit terminal 3 & Ground
   • If 10 ohms or greater 
   1. Disconnect the concerned ground connection.
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 3 @ Component harness & The other end of the circuit @ Ground terminal
      • 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: Steering Wheel Control Switches = Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
   3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ S70F Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   4. Test for infinite resistance between the test points: Signal circuit terminal 2 @ S70F Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: S70R Steering Wheel Controls Switch - Right
   • Go to next step: If the specified state 
6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 3 @ S70F Component harness
7. Verify the scan tool parameter: Steering Wheel Control Switches = Volume Down Button
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
   3. Ignition - On/Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ S70F 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 less than 2 ohms between the test points: Signal circuit terminal 1 @ S70F Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S70R Steering Wheel Controls Switch - Right
   • Go to next step: If the specified state 
8. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground circuit terminal 3 @ S70F Component harness
9. Verify the scan tool parameter: Steering Wheel Control Switches = Volume Up Button
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
   3. Ignition - On/Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ S70F 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 less than 2 ohms between the test points: Signal circuit terminal 2 @ S70F Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S70R Steering Wheel Controls Switch - Right
   • Go to next step: If the specified state 
10. Test or replace the component: S70F Steering Wheel Controls Switch - Radio Volume