Circuit/System Testing

All Controls Malfunction

1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right. 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 6 and ground.
   • If greater than 10 Ω 
   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. Verify that a test lamp illuminates between the B+ circuit terminal 7 and ground.
   • If the test lamp does not illuminate and the circuit fuse is good 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the B+ circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF.
   2. Test for infinite resistance between the B+ circuit terminal 7 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S70R Steering Wheel Controls Switch - Right.
   • If the test lamp illuminates 
5. Test for 2 - 10 V between the serial data circuit terminal 5 and ground.
   • If less than 2 V 
   1. Ignition 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. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, ignition ON.
   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 
6. Test or replace S70R Steering Wheel Controls Switch - Right

Left Controls Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
   • If greater than 10 Ω 
   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. Test for 4.8 - 5.2 V between the volt between the following signal circuits and ground
   • Voice - Terminal 1
   • Mute - Terminal 3
   • If less than 4.8 V 
   1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
   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, replace the P16 Instrument Cluster.
   • If greater than 5.2 V 
   1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, ignition ON.
   2. Test for less than 1 V between the signal 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 4.8 - 5.2 V 
4. Replace the S70L Steering Wheel Controls Switch - Left.