Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the P17 Info Display Module.
Ignition ON.
Verify a test lamp does not illuminate between the signal circuit terminal 8 and ground.
- If the test lamp illuminates
1. Ignition OFF, disconnect the harness connector at the A26 HVAC Controls. 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 A26 HVAC Controls.
- If the test lamp does not illuminate
Test for greater than 11 V between the signal circuit terminal 8 and ground while pressing the eject switch.
- If less than 11 V.
1. Ignition OFF, disconnect the harness connector at the A26 HVAC Controls.
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 A26 HVAC Controls.
- If greater than 11 V.
Test or replace the P17 Info Display module.