B1445

DTC B1445

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B1445 02
- Control Module Voltage Output Circuit Short to Ground

Diagnostic Fault Information





Circuit/System Description

The body control module (BCM) controls the wired accessory power components by applying voltage to the ignition voltage circuit at harness connector X4 terminal 12. Voltage is applied when the ignition switch is in the ACCESSORY or the ON position.

Conditions for Running the DTC

* The system voltage is between 9-16 V.
* The DTC can only set when the output is actively being requested by the module. Refer to Circuit/System Description for specific conditions.

Conditions for Setting the DTC

The DTC will set only when the module requests the output and there is a short to ground in the ignition voltage circuit.

Action Taken When the DTC Sets

The module output driver will be shut down and not supply voltage to the circuit.

Conditions for Clearing the DTC

* The current DTC will clear when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Reference Information
Schematic Reference

Power Distribution Schematics (Power Distribution Schematics)

Power Moding Schematics (Power Moding Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Retained Accessory Power Description and Operation (Retained Accessory Power)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the KR70 RAP/ACCY relay.
2. Test for less than 10 Ohms between the ground control circuit terminal 86 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.

• If the test does not illuminate, test the B+ circuit for short to ground or an open/high resistance.

4. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
5. Command the RAP/ACCY relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the command states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

6. Connect the RAP/ACCY relay. Disconnect the harness connector at the center console accessory power outlet.
7. Connect a test lamp between the ignition circuit terminal A and ground.
8. Command the RAP/ACCY relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the command states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR70 RAP/ACCY relay.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the KR70 RAP/ACCY relay.

Component Testing

1. Ignition OFF, disconnect the KR70 RAP/ACCY relay.
2. Test for 70-150 Ohms between terminals control circuit terminal 85 and ground terminal 86.

• If not within the specified range, replace the KR70 RAP/ACCY relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87

• If not the specified value, replace the KR70 RAP/ACCY relay.

4. Install a 3 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ohms between terminals 30 and 87.

• If greater than the specified range, replace the KR70 RAP/ACCY relay.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming