Circuit/System Testing

Ignition OFF/vehicle OFF and all vehicle systems OFF. Disconnect the harness connector at the A20 Radio/HVAC Controls. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the low reference circuit terminal 10 and ground.
- If 10 Ω of greater
1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the P17 Info Display Module.
2. Test for less than 2 Ω in the low reference circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the P17 Info Display Module
- If less than 10 Ω
Ignition ON/vehicle in Service Mode.
Test for 2.5 - 3.5 V on the signal circuit terminal 6 and ground.
- If less than 2.5 V
1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
2. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground.
  - 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 A11 Radio.
- If greater than 3.5 V
1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
2. Ignition ON/vehicle in Service Mode, 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 A11 radio.
- If between 2.5 - 3.5 V
Test or replace the A20 Radio/HVAC Controls