Circuit Description
The body control module (BCM) controls the automatic transmission shift lock control solenoid ground circuit and monitors the voltage of the ground control circuit.
Conditions for Running the DTC
The control ground circuit of the automatic transmission shift lock control solenoid must be OFF.
Conditions for Setting the DTC
| • | The body control module (BCM) detects the controlled ground circuit voltage is approximately equal to ground in the OFF state. |
| • | The condition above must be present for more than 0.3 seconds. |
| • | This DTC will be set after 20 seconds due to possible false failures. |
Action Taken When the DTC Sets
The BCM stores DTC B2712 in memory.
Conditions for Clearing the DTC
| • | A current DTC B2712 will clear if the short to ground or open in the controlled ground circuit of the automatic transmission shift lock control solenoid is no longer detected by the body control module (BCM). |
| • | A history DTC B2712 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | A scan tool may be used to clear the DTC. |
Diagnostic Aids
| • | If DTC B2712 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent short to ground or open in the controlled ground circuit of the automatic transmission shift lock control solenoid. |
| - | The automatic transmission shift lock control solenoid coil is intermittently shorted to ground internally. |
| - | The body control module (BCM) is intermittently shorted to ground internally. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Listen for an audible click when the automatic transmission shift lock control solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
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Tests for voltage at the automatic transmission shift lock control solenoid.
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Verifies that the body control module (BCM) is providing ground to the automatic transmission shift lock control solenoid.
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Tests if ground is constantly being applied to the automatic transmission shift lock control solenoid.
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The body control module must be programmed for the vehicle RPO configuration.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Shift Lock Control Schematics | |||
1 | Did you perform the Automatic Transmission Shift Lock Control Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Automatic Transmission Shift Lock Control |
Does the automatic transmission shift lock control solenoid turn ON and OFF with each command? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 8 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 11 | Go to Step 5 | |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 | |
6 | Test the control circuit of the automatic transmission shift lock control solenoid for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 12 |
7 | Test the control circuit of the automatic transmission shift lock control solenoid for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 12 |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 13 |
9 | Test the A/T shift lock control solenoid supply voltage circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 10 |
10 |
Did you find and correct the condition? | Go to Step 17 | Go to Step 14 |
11 | Inspect for poor connections at the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 15 |
12 | Inspect for poor connections at the harness connector of the body control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 16 |
13 | Repair the ignition 1 voltage circuit of the automatic transmission shift lock control switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 17 | -- |
14 | Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement? | Go to Step 17 | -- |
15 | Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement . Did you complete the replacement? | Go to Step 17 | -- |
|
Important: Perform the set up procedure for the body control module (BCM). Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 17 | -- | |
17 |
Does the DTC reset? | Go to Step 2 | System OK |
