Circuit Description
The battery rundown protection function allows the body control module (BCM) to disable the courtesy lamps and the underhood lamp 20 minutes after the ignition switch is turned OFF. The BCM monitors the output of the inadvertent power relay on Inadvertent Power Relay control circuit.
Conditions for Running the DTC
The system voltage must be between 9.0 and 16.0 volts.
Conditions for Setting the DTC
| • | When the Inadvertent Power Relay control circuit is shorted to ground. |
| • | When there is an open or short to battery voltage on the Inadvertent Power Relay ground circuit. |
| • | An open CTSY fuse or open in the battery supply circuit to the Inadvertent Power Relay. |
| • | The above conditions must be met for 0.5 seconds. |
Action Taken When the DTC Sets
The following lamps will be disabled:
| • | The dome lamp |
| • | The glove box lamps |
| • | The reading lamps (if equipped) |
| • | The underhood lamp |
| • | The vanity mirror lamps (if equipped) |
Conditions for Clearing the MIL/DTC
| • | The Conditions for Setting the DTC are no longer present. |
| • | A history DTC will clear after 40 malfunction free ignition cycles. |
| • | The Powertrain Control Module (PCM) receives the clear code command from the scan tool. |
Diagnostic Aids
| • | Check for an open in battery feed circuit to the Inadvertent Power Relay or an open CTSY LP fuse. |
| • | Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Listen for an audible click when the inadvertent power relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
-
Tests for voltage at the coil side of the inadvertent power relay. The CTSY fuse supplies power to the coil side of the inadvertent power relay.
-
Verifies that the body control module is providing ground to the inadvertent power relay.
-
Tests if a ground is constantly applied to the inadvertent power relay.
-
Since this is a general circuit malfunction code, it is necessary to test for both a short to voltage as well as an open on this circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Power Distribution Schematics | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
Does the inadvertent power 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 inadvertent power relay for a short to voltage or 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 inadvertent power 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 inadvertent power 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. 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 coil side feed circuit of the inadvertent power relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 13 | -- |
11 | Replace the inadvertent power relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | -- | Go to Step 13 | -- |
12 |
Important: Perform the set up procedure for the 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 13 | -- |
13 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
