Circuit Description
With the ignition ON, ignition 1 voltage is supplied to the coil side feed of the PARK relay. The control circuit of the PARK relay is controlled by the body control module (PZM). When the PZM receives a class 2 serial data message from the powertrain control module (PCM) stating that the automatic transmission is in the PARK position the PZM grounds the control circuit of the PARK relay via an internal switch called a driver. The driver supplies a path to ground for the component being controlled. Each driver has a fault line which the PZM monitors. When the PZM commands the PARK relay ON, the voltage of the control circuit should be low, near 0 volts. If the circuit voltage is measured above the fault line the DTC is set.
Conditions for Running the DTC
Ignition in the ON position.
Conditions for Setting the DTC
The PZM determines that the PARK relay control circuit is shorted to ground.
Action Taken When the DTC Sets
The PZM will continue commanding the requested state until the state is achieved or until the request changes.
Conditions for Clearing the DTC
The PZM determines that the PARK relay control circuit is no longer shorted to ground.
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 PARK relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
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Tests for voltage at the coil side of the Park relay. The CRUISE fuse supplies power to the coil side of the PARK relay.
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Verifies that the PZM is providing ground to the PARK relay.
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Tests if ground is constantly being applied to the PARK relay.
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Test if the control circuit of the PARK relay is opened.
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 PARK relay 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 10 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 | |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 | |
Test the control circuit of the PARK relay for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 | |
7 | Test the control circuit of the PARK relay 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 13 | Go to Step 9 |
8 | Inspect for poor connections at the PARK relay. 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 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the body control module (PZM). 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 13 | Go to Step 12 |
10 | Repair the open in the ignition 1 voltage circuit of the PARK relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the PARK relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the body control module (PZM). Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
