Circuit/System Testing

WARNING: This page is about a different car, the 2013 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.

All Controls Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right, ignition ON.
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
1. 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
Test or replace S70R Steering Wheel Controls Switch - Right

Left Controls Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
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
Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
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
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
Replace the S70L Steering Wheel Controls Switch - Left.