Diagnostic System Check - Automatic Transmission Shift Lock Control

WARNING: This page is about a different car, the 2002 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table no information has been omitted

2. 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

5. 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

DIAGNOSTIC SYSTEM CHECK - AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL

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
2	1. Turn ON the ignition, with the engine OFF. 2. Attempt to establish communication with the body control module (BCM) and the powertrain control module (PCM). Does the scan tool communicate with the BCM and PCM?	Go to Step 3	Go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in Data Link Communications
3	Important: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode. 1. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool. 2. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions?	Go to Step 4	Go to POWER MODE MISMATCH in Body Control System
4	Select the display DTCs function for both the BCM and PCM on the scan tool. Does the scan tool display any DTCs?	Go to Step 5	Go to SYMPTOM TESTS
4		Go to Step 5	Go to SYMPTOM TESTS
5	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 6
6	Does the scan tool display DTC B1000, B1004, B1007, B1009 or B1010?	Go to DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE	Go to Step 7
7	Does the scan tool display DTC B1327?	Go to DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE l	Go to SYMPTOM TESTS