Pinpoint Test B: The Compass Is Inoperative

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

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

B1 CHECK CIRCUIT 294 (WH/LB) 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 294 (WH/LB), harness side and ground.
  
  Fig 1: Checking Circuit 294 (WH/LB) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. YES : Go to B2.
2. NO : VERIFY the CJB fuse 18 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
B2 CHECK CIRCUIT 875 (BK/LB) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the compass sensor module C909-4, circuit 875 (BK/LB), harness side and ground.
  
  Fig 2: Checking Circuit 875 (BK/LB) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. YES : Go to B3.
2. NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
B3 CHECK CIRCUIT 702 (WH/BK) FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Instrument Cluster C220b
- Measure the resistance between the compass sensor module C909-2, circuit 702 (WH/BK), harness side and the instrument cluster C220a-16, circuit 702 (WH/BK), harness side; and between the compass sensor module C909-2, circuit 702 (WH/BK), harness side and ground.
  
  Fig 3: Checking Circuit 702 (WH/BK) For Open And Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance 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?
1. YES : Go to B4.
2. NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
B4 CHECK CIRCUIT 703 (WH/OG) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between the compass sensor module C909-1, circuit 703 (WH/OG), harness side and the instrument cluster C220a-15, circuit 703 (WH/OG), harness side; and between the compass sensor module C909-1, circuit 703 (WH/OG), harness side and ground.
  
  Fig 4: Checking Circuit 703 (WH/OG) For Open And Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance 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?
1. YES : Go to B5.
2. NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
B5 CHECK THE COMPASS SENSOR MODULE
- Install a known good compass sensor module.
- Key in ON position.
- Does the compass operate correctly?
1. YES : SET the zone and CALIBRATE the compass. REFER to Compass Calibration in this article. TEST the system for normal operation.
2. NO : INSTALL the original compass sensor module. Go to B6 .
B6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER article. TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.