Diagnostic Starting Point - Automatic Transmission Shift Lock Control
Begin the system diagnosis with Diagnostic System Check - Vehicle in Vehicle DTC Information. The Diagnostic System Check - Vehicle will provide the following information
- The identification of the control modules which command the system
- The ability of the control modules to communicate through the serial data circuit
- The identification of any stored DTCs and their status
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.
Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. | |||
| Battery Voltage Signal | BCM Data | 0-15 volts | 14 volts |
| Shift Lock Solenoid Command | BCM Data | Lock/Unlock | Lock |
Body Control Module (BCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. | |||
| Initial Brake Apply Signal | PCM Data Display | Applied/Released | Released |
| BPP Circuit Signal | ECM Data Display | Applied/Released | Released |
| IMS A/B/C/P | ECM Transmission Data | LOW, HI | LOW, LOW, LOW, HI |
| TR Sw. A/B/C/P | PCM Transmission Data | LOW, HI | LOW, LOW, LOW, HI |
| TCC Brake Switch | ECM/PCM Transmission Data | Open/Closed | Closed |
Engine Control Module (ECM) / Powertrain Control Module (PCM)
Circuit Description
The body control module (BCM) controls the automatic transmission shift lock control solenoid by providing a battery positive voltage to the solenoid. The BCM utilizes a smart driver to control the voltage supply circuit to the automatic transmission shift lock control solenoid. The smart driver monitors the voltage and current flow of the control circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC
DTC B2705 Gearshift Unlock Circuit
This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to Symptoms - Vehicle .
| DTC Symptom | DTC Symptom Descriptor |
|---|---|
| 02 | Short to Ground |
| 05 | Short to Battery or Open |
DTC B2705
Conditions for Running the DTC
- The ignition switch is in the ON position.
- The brake pedal is pressed.
- The transmission is in the PARK position.
Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control. Refer to «Checking Aftermarket Accessories»(ref-242973-S33559790262006082100000) .
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom
- «Shift Lever Does Not Move with Brake Pedal Depressed»(ref-243035-S07328356852006082100000)
- «Shift Lever Can Be Moved without Brake Pedal Depressed»(ref-243035-S01885887332006082100000)