Pinpoint Test D: The Compass Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

D1 CHECK CIRCUIT 1173 (BN/OG) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Compass Sensor Module C909.
- Key in ON position.
- Measure the voltage between the compass sensor module C909-3, circuit 1173 (BN/OG), harness side and ground.
  
  Fig 1: Checking Circuit 1173 (BN/OG) For Voltage
- Is the voltage greater than 10 volts?
Yes : GO to D2.

No : VERIFY the smart junction box (SJB) fuse 22 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
D2 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the compass sensor module C909-4, circuit 570 (BK/WH), harness side and ground.
  
  Fig 2: Checking Circuit 570 (BK/WH) For An Open
- Is the resistance less than 5 ohms?
Yes : GO to D3.

No : REPAIR the circuit. TEST the system for normal operation.
D3 CHECK CIRCUIT 702 (WH/BK) AND CIRCUIT 703 (WH/OG) FOR AN OPEN AND A SHORT TO GROUND
- Disconnect: Instrument Cluster C220.
- Measure the resistance between the compass sensor module C909-2, circuit 703 (WH/OG), harness side and the instrument cluster C220-6, circuit 703 (WH/OG), harness side; and between the compass sensor module C909-2, circuit 703 (WH/OG), harness side and ground.
  
  Fig 3: Checking Circuit 702 (WH/BK) And Circuit 703 (WH/OG) For An Open And A Short To Ground (1 Of 2)
- Measure the resistance between the compass sensor module C909-1, circuit 702 (WH/BK), harness side and the instrument cluster C220-5, circuit 702 (WH/BK), harness side; and between the compass sensor module C909-1, circuit 702 (WH/BK), harness side and ground.
  
  Fig 4: Checking Circuit 702 (WH/BK) And Circuit 703 (WH/OG) For An Open And A Short To Ground (2 Of 2)
- Are the resistances less than 5 ohms between the compass sensor module and the instrument cluster, and greater than 10,000 ohms between the compass sensor module and ground?
Yes : INSTALL a new compass sensor module. SET the zone. REFER to COMPASS ZONE ADJUSTMENT in this article. CALIBRATE the compass. REFER to COMPASS CALIBRATION in this article. TEST the system for normal operation.

No : REPAIR the circuit in question. TEST the system for normal operation.