Circuit/System Testing

All Controls Malfunction

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right, Vehicle in Service Mode.
2. Test for 2-10 V between the serial data circuit terminal 5 and ground.
   • If less than 2 V 
   1. Vehicle OFF, disconnect the harness connector at the P16 Instrument Cluster.
   2. Test for infinite resistance between the serial data 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 serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 Instrument Cluster.
   • If greater than 10 V 
   1. Vehicle OFF, disconnect the harness connector at the P16 Instrument Cluster, Vehicle in Service Mode.
   2. Test for less than 1 V between the serial data circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the P16 Instrument Cluster.
      • If between 2-10 V 
3. Test or replace S70R Steering Wheel Controls Switch - Right

Left Controls Malfunction

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, Vehicle in Service Mode.
2. Test for less than 1 volt between the following signal circuits and ground
   • Voice - Terminal 1
   • Mute - Terminal 3
   • If 1 volt or greater 

     Repair the short to voltage on the circuit.

   • If less than 1 volt 
3. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
4. Test for infinite resistance between the following signal circuit terminals and ground.
   • Voice - Terminal 1
   • Mute - Terminal 3
   • If less than infinite resistance 

     Repair the short to ground on the circuit

   • If infinite resistance 
5. Test for less than 2 Ω on the following signal circuit terminals
   • S70R Steering Wheel Control Switch - Right signal circuit terminal 1 and S70L Steering Wheel Control Switch - Left signal circuit terminal 1
   • S70R Steering Wheel Control Switch - Right signal circuit terminal 3 and S70L Steering Wheel Control Switch - Left signal circuit terminal 3
   • If 2 Ω or greater 

     Repair the open/high resistance in the circuit.

   • If less than 2 Ω 
6. Replace the S70L Steering Wheel Controls Switch - Left.