Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition. The instrument panel module (IPM) is used on vehicles with automatic climate control (w/CJ2). The climate control panel is (CCP) used with standard climate control systems (w/C67).
-
DTCs from all of the modules listed must be retrieved. The symptom list in Symptoms will determine the correct diagnostic procedure to use.
-
The presence of DTCs which begin with U indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
Step | Action | Yes | No | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up In Data Link Communications | ||||||||||||||
Does the scan tool communicate with above listed modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||||||||||
Select one of the following control modules to display DTCs function on the scan tool:
Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms | |||||||||||||||
Does the scan tool display any DTCs which begin with a U? | Go to Scan Tool Does Not Communicate with Class 2 Device In Data Link Communications | Go to Step 5 | |||||||||||||||
5 | Does the scan tool display DTC B1000, B1004, B1007, B1009 or B1010? | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System | Go to Step 6 | ||||||||||||||
6 | Does the scan tool display DTC B1327? | Go to Diagnostic Trouble Code (DTC) List/Type in Engine Electrical |
