Secondary and Configurable Customer Controls

DTC B1405

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 Descriptors
DTC B1405 03
- Control Module Voltage Reference Output 2 Circuit Low Voltage

DTC B1405 07
- Control Module Voltage Reference Output 2 Circuit High Voltage

Diagnostic Fault Information





Circuit/System Description

The body control module (BCM) monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components and/or incorrect operation can occur when the voltage is out of range.

Conditions for Running the DTC

Ignition is ON.

Conditions for Setting the DTC

The BCM detects a low/high voltage on the control circuit.

Action Taken When the DTC Sets

None.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

Reference Information
Schematic Reference

Exterior Lights Schematics (Exterior Lights Schematics)
Connector End View Reference

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

Exterior Lighting Systems Description and Operation (Exterior Lighting Systems)
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 Verification

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 V.

If not within the specified range, refer to Charging System Test (Charging System Test).

Circuit/System Testing

1. Ignition OFF, disconnect the X2 and the X1 harness connector at the K9 Body Control Module.
2. Test for less than 5 ohm between the X2 harness connector ground circuit terminal 2 and ground.

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

3. Test for less than 5 ohm between the X1 harness connector ground circuit terminal 1 and ground.

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

4. Ignition ON, test for more than 11 V between the X2 harness connector terminal 1 and ground.

• If less than the specified value test the control circuit for an open/high resistance.

5. If all circuits test normal, replace the K9 Body Control Module.

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