Diagnosis And Testing - Compass/Temperature Mirror: Notes

WARNING: This page is about a different car, the 2005 Dodge SX, 2005 Dodge SRT-4, and 2005 Dodge Neon. However, it is still accessible from the selected car via links, so may be relevant.

If the Compass/Temperature mirror lights up and functions, however the accuracy of the information displayed is in question or certain displays are not working, refer to COMPASS/TEMPERATURE MIRROR SELF-DIAGNOSTIC TEST . If the mirror doesn't light up or function, proceed with the following preliminary tests:

Disconnect the compass/temperature mirror electrical connector. Using a voltmeter, check for 12v on the fused B+ circuit cavity. Voltage should be present. If OK go to step 2, If NOT OK, repair the short or open circuit as required.
Using a voltmeter, check for 12v on the fused ignition run circuit cavity with the ignition switch in the RUN position. Voltage should be present. If OK go to step 3, If NOT OK, repair the short or open circuit as required.
Key Off. Using a ohmmeter, check for continuity to a good ground on the ground circuit cavities of the compass/temperature mirror electrical connector. Continuity should be present. If OK, replace the mirror assembly, If NOT OK, repair the short or open circuits as required.