B097C

Vehicle ON/OFF Switch Indicator Malfunction - DTC B097C

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 B097C 02
- Power Mode Run/Crank Indicator Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicates the vehicle power mode. When the vehicle is in the OFF mode, the LED is not illuminated. Pressing and holding the vehicle ON/OFF switch for five seconds, without the brake pedal applied, will enter the Vehicle Service Mode and the blue LED will illuminate. With the vehicle OFF and the brake pedal applied, pressing the vehicle ON/OFF switch once, the vehicle will enter the Vehicle ON mode and the blue LED will illuminate.

The vehicle ON/OFF switch contains two individual switches that provides redundant switch inputs to both the body control module (BCM) and the keyless entry control module. The BCM supplies the vehicle ON/OFF switch a constant B+ signal. The BCM monitors this signal to determine if the switch is released or pressed. When the vehicle ON/OFF switch is not pressed, voltage on the signal circuit is pulled down through two resistors in the switch. When the vehicle ON/OFF switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the BCM and indicating that the vehicle ON/OFF switch is pressed.

The keyless entry control module monitors voltage on the switch is the same manner as the BCM, but monitors the second switch located in the vehicle ON/OFF switch.

Conditions for Running the DTC

Control module voltage is 9-16 V

Conditions for Setting the DTC

* The BCM detects a short to ground in the control circuit.
* The above condition exists for more than 1 minute.

Action Taken When the DTC Sets

The BCM disables the control output.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module power mode cycle counter reaches 40, without a repeat of the malfunction.

Reference Information
Schematic Reference

Power Moding Schematics Power Moding Schematics
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Power Mode Description and Operation Power Mode
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

With the brake pedal released, press and hold the vehicle ON/OFF switch for 5 seconds. The blue LED should illuminate and the vehicle should be in Service Mode.

Circuit/System Testing

1. Vehicle OFF, disconnect the harness connector at the S83 vehicle ON/OFF switch.
2. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the ground circuit terminal 4 and ground.

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

3. Test for less than 1 V between the control circuit terminal 5 and ground.

• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.

4. Connect the harness connector at the S83 vehicle ON/OFF switch.
5. Vehicle in Service Mode, disconnect the harness connector at the S83 vehicle ON/OFF switch.
6. Verify a test lamp illuminates between the control circuit terminal 5 and ground.

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.

7. If all circuits test normal, test or replace the S83 vehicle ON/OFF switch.

Component Testing

1. Vehicle OFF, disconnect the harness at the S83 vehicle ON/OFF switch.
2. Connect a jumper wire between the S83 vehicle ON/OFF switch terminal 4 and ground.
3. Connect a 3 A fused jumper wire between the S83 vehicle ON/OFF switch terminal 5 and B+. Verify the blue LED illuminates.

• If the LED does not illuminate, replace the S83 vehicle ON/OFF switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Ignition and Start Switch Replacement Service and Repair
* Control Module References Programming and Relearning for the BCM replacement, programming, and setup