Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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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).
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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 | |||||||||||||||||
3 | 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 System Check - Body Control System 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 |
