Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF/vehicle OFF, disconnect the harness connector at the A22 Radio Controls.
Test for less than 10 Ω between the following low reference circuit terminals and ground.
- terminal 2
- terminal 8
- If 10 Ω or greater
1. Disconnect the X1 harness connector at the P17 Info Display Module.
2. Test for less than 2 Ω in the low reference circuits 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 between the following signal circuit terminals and ground:
- terminal 3
- terminal 4
- terminal 6
- terminal 7
- If less than 2.5 V
1. Ignition OFF/vehicle OFF, disconnect the X2 harness connector at the A11 Radio.
2. Test for infinite resistance between the control 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 on the control 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 X2 harness connector at the A11 Radio.
2. Test for less than 1 V between the control circuit and ground
  - If greater than 1 V, repair the short to voltage in the circuit.
  - If less than 1 V, replace the A11 Radio.
- If between 2.5-3.5 V
Replace the A22 Radio Controls