Circuit Description
The body control module (BCM) controls the automatic transmission (A/T) shift lock control solenoid by providing battery voltage to the solenoid. The BCM utilizes a smart driver to control the voltage supplied to the A/T shift lock control solenoid. The smart driver monitors the voltage and current flow of the control circuit. DTC B2707 will set when the BCM detects a short to ground, during the shift lock control solenoid operation.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2707 Gearshift Unlock Circuit Low
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | The brake pedal is depressed. |
| • | The transmission is in the PARK position. |
Conditions for Setting the DTC
The BCM detects the shift lock control solenoid control circuit is grounded for a minimum of 1 second.
Action Taken When the DTC Sets
The BCM disables shift lock control solenoid operation, until the next key cycle.
Conditions for Clearing the DTC
| • | A current DTC B2707 will clear when the malfunction is no longer present and the ignition switch is cycled. |
| • | All BCM history codes will clear after 100 ignition cycles with no current codes active during the 100 ignition cycles. |
Diagnostic Aids
| • | If the A/T shift lock control circuit is shorted to ground, the A/T shift lock control solenoid will be inoperative. The shift lever will not shift out of PARK position with the brake pedal depressed. |
| • | Perform the tests while wiggling the wires and connectors. This may often cause an intermittent malfunction to appear. Refer to Testing for Intermittent Conditions and Poor Connections . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Listen for an audible click when the A/T shift lock control solenoid operates. Command both the ON and OFF states. Repeat the commands, as necessary.
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This step tests for voltage at the controlled voltage supply circuit of the A/T shift lock control solenoid.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Shift Lock Control Schematics Connector End View Reference: Computer/Integrating Systems Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the automatic transmission (A/T) shift lock control solenoid turn ON and OFF with each command? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
Does the test lamp illuminate ON and OFF with each command? | Go to Step 5 | Go to Step 4 | |
4 | Test the control circuit of the A/T shift lock control solenoid for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the A/T shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the A/T shift lock control solenoid. Refer Shift Lock Control Solenoid Replacement . Did you complete the replacement? | Go to Step 9 | -- |
8 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
