Circuit Description
The underhood fuse block supplies battery positive voltage to the REVERSE relay coil. The BCM provides ground to the REVERSE relay in the control circuit. The BCM monitors the voltage in the REVERSE relay control circuit every 1000 ms.
Conditions for Running the DTC
A short to ground in the control circuit of the REVERSE relay will be tested when the following conditions are met:
| • | The ignition is ON. |
| • | The REVERSE relay is de-energized. |
| • | DTC B1982, and B1983 are not present. |
Conditions for Setting the DTC
The DTC will set when the REVERSE relay is de-energized, and the BCM detects that the control circuit of the REVERSE relay is low for at least 2 seconds.
Action Taken When the DTC Sets
The BCM turns OFF the REVERSE relay output, until the fault is no longer present.
Conditions for Clearing the DTC
The DTC will clear when the BCM detects that the control circuit of the REVERSE relay is no longer low for at least 2 seconds.
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 REVERSE 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 REVERSE relay . The underhood fuse block supplies battery positive voltage to the REVERSE relay coil.
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Verifies that the BCM is providing ground to the REVERSE relay.
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Tests if ground is constantly being applied to the REVERSE relay.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics | |||
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | |
Does the REVERSE 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 8 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 9 | 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 REVERSE relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
7 | Test the control circuit of the REVERSE 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 14 | Go to Step 10 |
8 | Test for an open or short to ground in the supply voltage circuit of the REVERSE relay coil. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 11 |
9 | Inspect for poor connections at the REVERSE 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 14 | Go to Step 12 |
10 | 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 in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
11 | Repair a short to ground in the supply voltage circuit of the backup lamps. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | -- |
12 | Replace the REVERSE relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 14 | -- |
13 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 14 | -- |
14 |
Does the DTC reset? | Go to Step 2 | System OK |
