Transmission Code

P0930-BTSI CONTROL CIRCUIT LOW - SLA





Theory of Operation
The brake switch signal must be active before the shift lever can be moved out of the park position. The Shifter lever assembly receives two brake switch signals. The first signal is a CAN C Bus message sent to the shift lever assembly. The second signal is a hardwired brake switch signal to the shift lever assembly. The CAN C Bus message is the primary brake switch signal and the hardwired signal serves as the backup brake switch signal.
- When Monitored:
Continuously with the ignition on.
- Set Condition:
The DTC will set if the high side driver detects a short to ground for 10 seconds.

Possible Causes
- ENGINE BRAKE DTC S PRESENT
- ABS DTC S PRESENT
- (B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
- SHIFT LEVER ASSEMBLY

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Component Tests and General Diagnostics

Diagnostic Test
1. ENGINE DTC's PRESENT
With the scan tool, read Engine DTC's.
Are there any Engine brake DTC's present?
YES >>Refer to Computers and Control Systems/Testing and Inspection and perform the appropriate diagnostic procedure. Testing and Inspection
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test
NO >> Go To 2

2. ABS MODULE DTC's PRESENT
With the scan tool, read ABS Module DTC's.
Are there any ABS DTC's present?
YES >>Refer to BRAKES - ABS ELECTRICAL DIAGNOSTICS and perform the appropriate diagnostic procedure. Testing and Inspection
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test
NO >> Go To 3





3. (B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
Turn the ignition off to the lock position. Disconnect the Shift Lever Assembly harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the (B29) Brake Switch Signal circuit.
Is the resistance below 5.0 ohms? YES >>Repair the (B29) Brake Switch Signal for a short to ground. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test
NO >>Go To 4

4. SHIFT LEVER ASSEMBLY
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace the Shift Lever Assembly.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test