Compass/Mini-Trip Computer

COMPASS/MINI-TRIP COMPUTER
If the problem with the Compass/Mini-Trip Computer module is an inoperative security indicator lamp, refer to Security Indicator Lamp in Vehicle Theft/Security Systems. If the problem with the Compass/Mini-Trip Computer module is an "OC" or "SC" in the compass/thermometer display refer to Ambient Temperature Sensor in this section. If the problem with the Compass/Mini-Trip Computer module is an inaccurate or scrambled display, refer to CMTC Self-Diagnostic Test in this section. If the problem with the Compass/Mini-Trip Computer module is incorrect Vacuum Fluorescent Display (VFD) dimming levels, use a DRB scan tool and the proper Diagnostic Procedures to test for the correct dimming message inputs being received from the instrument cluster over the Chrysler Collision Detection (CCD) data bus.

If the problem is a no-display condition, use the following procedures. For complete circuit diagrams, refer to Overhead Console in the Contents of Wiring Diagrams.

1. Check the fused B(+) fuse in the junction block.
If OK, go to Step 2.
If not OK, repair the shorted circuit or component as required and replace the faulty fuse.

2. Check for battery voltage at the fused B(+) fuse in the junction block.
If OK, go to Step 3.
If not OK, repair the open fused B(+) circuit to the battery as required.

3. Check the fused ignition switch output (Run/Start) fuse in the junction block.
If OK, go to Step 4.
If not OK, repair the shorted circuit or component as required and replace the faulty fuse.

4. Turn the ignition switch to the ON position. Check for battery voltage at the fused ignition switch output (Run/Start) fuse in the junction block.
If OK, go to Step 5.
If not OK, repair the open fused ignition switch output (run/start) circuit to the ignition switch as required.

5. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Remove the overhead console. Check for continuity between the ground circuit cavities of the roof wire harness connector for the overhead console and a good ground. There should be continuity
If OK, go to Step 6.
If not OK, repair the open ground circuit to ground as required.

6. Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the roof wire harness connector for the overhead console.
If OK, go to Step 7.
If not OK, repair the open fused B(+) circuit to the junction block fuse as required.

7. Turn the ignition switch to the ON position. Check for battery voltage at the fused ignition switch output (Run/Start) circuit cavity of the roof wire harness connector for the overhead console.
If OK, refer to Self-Diagnostic Test for further diagnosis of the Compass/Mini-Trip Computer module and the CCD data bus.
Compass/Temperature Mini-Trip Computer (CMTC) Self-Diagnostics
Body Control Module
Information Bus

If not OK, repair the open fused ignition switch output (Run/Start) circuit to the junction block fuse as required.