Circuit Description
The Driver door Module (DDM) Diagnostic Check is an organized approach to identify problems associated with the Door Control System. This check is the starting point for all module complaints, and directs you to the next logical step in diagnosing the complaint. The module is a very reliable component and is not likely the cause of the malfunction. Most system complaints are linked to faulty wiring and connectors, and occasionally to components. Understanding the computer system and using the tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.
Diagnostic Aids
| • | The following conditions may result in an intermittent operation of the module with no DTC stored: |
| - | Any condition which results in the interruption of power to the module. |
| - | Out of range battery or ignition voltage. |
Specification
Normal module operating voltage: 9.0-16.0 V.
| - | A loose or damaged ground(s). |
| - | An open or shorted class 2 serial data line. |
| • | If the DTC is a history DTC the problem may be an electrical intermittent or poor connection. Clear all the DTC's and perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur and set a DTC. Perform a thorough inspection of all related wiring and connectors pertaining to the history DTC stored. Refer to Intermittents and Poor Connections Diagnosis in Wiring systems. |
| • | Refer to Using Connector Test Adapters in Wiring Systems whenever a diagnostic procedure request probing or checking a terminal using this adapter ensures that no damage to the terminal occurs and gives a idea of whether contact tension is sufficient. |
| • | Exit all scan tool tests before cycling the ignition OFF to ON unless the scan tool instructions direct otherwise. Follow the operating instructions in the scan tool operator's manual. Failure to follow these instructions may set DTC's, cause vehicle malfunctions, set false DTCs or cause scan tool malfunctions. |
Test Description
The numbers below refer to the step numbers on the diagnostic table:
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This test determines if communication can be established with the module.
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This test step determines whether communication can be established with other modules connected to the class 2 serial data line.
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This test step checks for stored DTCs.
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This test step checks for loss of Class 2 Serial Data Communication DTCs.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Does the scan tool communicate with the DDM? | -- | Go to Step 3 | Go to Step 2 | |
Attempt to establish communications with the other modules connected to the same serial data line (PCM, EBTCM, IPC, ect.). Did you establish communications? | -- | Go to Diagnostic System Check - Data Link Communications in Data Link Communications | Go to Data Link Communications System Check in Data Link Communications | |
Select Display DDM DTC function with the scan tool. Are any current DTCs stored? | -- | Go to Step 4 | Go to step 5 | |
Are U1161, U1162, U1170, U1300 and/or U1301 Loss of Class 2 Serial Data Communication DTCs set? | -- | Go to Diagnostic Trouble Code (DTC) List in Data Link Communications | Go to Step 5 | |
5 | Is the customer complaint with the power mirrors? | -- | Go to Step 6 | |
6 | Is the customer complaint with the power door locks? | -- |
