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.
   • 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.
      • 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.
   • 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 radio volume decreases.
   • If the volume does not decrease 

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

   • If the volume decreases 
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 volume increases.
   • If the volume does not increase 

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

   • If volume increases 
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.
   • 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.
      • 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.
   • 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 radio changes presets.
   • If radio does not change presets 

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

   • If radio changes presets 
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 radio changes presets.
   • If radio does not change presets 

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

   • If radio changes presets 
9. Test or replace the S70E Steering Wheel Controls Switch - Radio Presets.