CTS 04, 102K miles, New Battery When trying to start the car, the dash lights illuminate as normal, but no cranking action occurs. When trying to remove the key, the key will not turn back to the home position for key removal. While the key is stuck in the ignition, movement of the the transmission lever out of park is not functioning. After removing the main battery connections for approx. 15-30 min, and then reconnecting, the key can now be removed. After removing the key, and then reinserting, the car can then be started without any problem. After several test stop and starts immediately following the battery disconnect / reconnect, all appears to be right with the world. After an undetermined time or perhaps complete randomness, the original symptom appears again. Thanks, Bill
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components.
• The automatic transmission shift lock control solenoid
• The brake switch
• The rear integration module (RIM)
• The transmission control module (TCM) or powertrain control module (PCM)
With the ignition ON, battery positive voltage is supplied to the automatic transmission shift lock control solenoid from the ignition 3 relay. The automatic transmission shift lock control solenoid is controlled by the rear integration module. When the rear integration module (RIM) receives a class 2 serial data message from the transmission control module (TCM) or powertrain control module (PCM) indicating that the shift lever is in the PARK position the rear integration module (RIM) grounds the automatic transmission shift lock control solenoid control circuit. This causes the solenoid to energize mechanically locking the shift lever in the PARK position. When the driver presses the brake pedal the rear integration module receives the brake applied signal and turns off the ground to the automatic transmission shift lock control solenoid control circuit. This allows the shift lever to be moved out of the PARK position.
Step
Action
Yes
No
1
Install a scan tool.
Does the scan tool power up?
YES - Go to Step 2
NO - Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
2
Turn ON the ignition, with the engine OFF.
Attempt to establish communication with the Powertrain Control Module (PCM) and the Rear Integration Module (RIM).
Does the scan tool communicate with the PCM and the RIM?
YES - Go to Step 3
NO - 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.
Access the Ignition Switch parameter in the rear integration module (RIM) inputs data display list.
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?
YES - Go to Step 4
NO - Go to Power Mode Mismatch in Body Control System
4
Select the display DTCs function on the scan tool for the PCM and the RIM.
Does the scan tool display any DTCs for the PCM or the RIM?
YES - Go to Step 5
NO - Go to Symptoms - Automatic Transmission Shift Lock Control
5
Does the scan tool display any DTCs which begin with a "U"?
YES - Go to Diagnostic Trouble Code (DTC) List in Data Link Communications
NO - Go to Step 6
6
Does the scan tool display DTC B1000, B1004, B1007, or B1009?
YES - Go to Diagnostic Trouble Code (DTC) List in Body Control System
No - Go to Step 7
7
Does the scan tool display DTC B1327?
YES - Go to Diagnostic Trouble Code (DTC) List in Engine Electrical
NO - Go to Symptoms - Automatic Transmission Shift Lock Control
This is something best left to the Cadillac dealer !
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