CMTC Test 1A - Identifying CMTC Problems

NOTE: Perform SYMPTOM ID TEST 1A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION and WIRING DIAGRAM. Perform TEST VER-1A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.

Using scan tool, select BODY SYSTEM, then COMPASS MINI/TRIP. If scan tool displays BUS OPERATIONAL, go to next step. If scan tool displays NO RESPONSE, go to TEST 4A under VEHICLE COMMUNICATIONS. If scan tool displays any other message, go to TEST 1A under VEHICLE COMMUNICATIONS.
Using scan tool, select AUTO SELF TEST. If any segments fail to light or scan tool displays FAILED, replace CMTC module. CMTC module is located behind overhead console. See Figure under CMTC TEST 6A. If AUTO SELF TEST is okay, identify problem(s) listed in CMTC DIAGNOSTIC TEST DIRECTORY table and perform indicated test(s).

CMTC DIAGNOSTIC TEST DIRECTORY

Complaint

Perform

CMTC Displays SC

CMTC TEST 2A

CMTC Displays OC

CMTC TEST 3A

Distance To Empty Inoperative Or Wrong

INSTRUMENT CLUSTER TEST 3A

Incorrect Ambient Temperature Reading

CMTC TEST 4A

Average MPG Or Fuel Economy Inoperative Or Wrong