Pinpoint Test A: The Compass Is Inoperative

Electronic Compass

Pinpoint Tests

Pinpoint Test A: The Compass Is Inoperative

Refer to Wiring Diagram Set 124, Power Mirrors for schematic and connector information. Diagrams By Number

Normal Operation

The compass display and module are integrated into the interior rear view mirror. The interior rear view mirror receives switched battery voltage through circuit 46 (VT). Circuit 1205 (BK) provides the mirror/compass ground.

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- Interior rear view mirror



PINPOINT TEST A: THE COMPASS IS INOPERATIVE

NOTE: Make sure the compass is turned on by pressing the MODE button before carrying out this pinpoint test.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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A1 CHECK CIRCUIT 46 (VT) FOR VOLTAGE


- Ignition OFF.
- Disconnect: Interior Rear View Mirror C911.
- Ignition ON.
- Measure the voltage between the interior rear view mirror C911-1, circuit 46 (VT), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY the Smart Junction Box (SJB) fuse 7 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the short circuit. TEST the system for normal operation.

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A2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the interior rear view mirror C911-2, circuit 1205 (BK), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new interior rear view mirror. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

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