Pinpoint Test Ca: The Compass Is Inoperative
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:
Always set the zone and calibrate the compass before replacing an inaccurate compass module.
- CA1 CHECK THE AUTO-DIMMING INTERIOR MIRROR VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: Auto-Dimming Interior Mirror C911 or C9039 (Camera Display Mirror).
- Ignition ON.
- Measure the voltage between the auto-dimming interior mirror C911-1 or C9039-1 (camera display mirror), circuit CBP41 (BU), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes: GO to CA2.
- No: VERIFY the BCM fuse 32 (15A). If OK, REPAIR circuit CBP32 (GN/VT) for an open. TEST the system for normal operation. If not OK, REFER to the OEM WIRING DIAGRAMS (EXCEPT HYBRID) or OEM WIRING DIAGRAMS (HYBRID) to identify the possible causes of the circuit short.
- CA2 CHECK THE COMPASS MODULE GROUND CIRCUIT FOR AN OPEN
- If not equipped with a camera display mirror, measure the voltage between the auto-dimming interior mirror C911-1, circuit CBP41 (BU), harness side and auto-dimming interior mirror C911-4, circuit GD139 (BK/YE), harness side and ground.
- If equipped with a camera display mirror, measure the voltage between the auto-dimming interior mirror C9039-1, circuit CBP41 (BU), harness side and auto-dimming interior mirror C9039-3, circuit GD139 (BK/YE), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes: GO to CA3.
- No: REPAIR circuit GD133 (BK) for an open. CLEAR the DTCs. REPEAT the self-test.
- CA3 CHECK THE COMPASS COMMUNICATION CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: IPC C220.
- Ignition ON.
- Measure the voltage between the auto-dimming interior mirror C911-9 or C9039-9 (camera display mirror), circuit VMC31 (GY/BU), harness side and ground; and between the auto-dimming interior mirror C911-10 or C9039-10 (camera display mirror), circuit VMC30 (BU/GY), harness side and ground.
- Is any voltage present?
- Yes: REPAIR the circuit in question for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
- No: GO to CA4.
- CA4 CHECK THE COMPASS COMMUNICATION PLUS (+) CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the IPC C220-23, circuit VMC30 (BU/GY), harness side and the auto-dimming interior mirror C911-10 or C9039-10 (camera display mirror), VMC30 (BU/GY), harness side; and between the IPC C220-23, circuit VMC30 (BU/GY), harness side and ground.
- Is the resistance less than 5 ohms between the IPC and the auto-dimming interior mirror, and greater than 10, 000 ohms between the IPC and ground?
- Yes: GO to CA5.
- No: REPAIR the circuit for an open or short to ground. CLEAR the DTCs. REPEAT the self-test.
- CA5 CHECK THE COMPASS COMMUNICATION MINUS (-) CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the IPC C220-24, circuit VMC31 (GY/BU), harness side and the auto-dimming interior mirror C911-9 or C9039-9 (camera display mirror), VMC31 (GY/BU), harness side; and between the IPC C220-24, circuit VMC31 (GY/BU), harness side and ground.
- Is the resistance less than 5 ohms between the IPC and the auto-dimming interior mirror, and greater than 10, 000 ohms between the IPC and ground?
- Yes: GO to CA6.
- No: REPAIR the circuit for an open or short to ground. CLEAR the DTCs. REPEAT the self-test.
- CA6 CHECK FOR CORRECT IPC OPERATION
- Disconnect the IPC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new IPC. REFER to INSTRUMENT PANEL CLUSTER (IPC) . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.