To the top of the document
Volt
   
GMDE Start Page Load static TOC Load dynamic TOC Help?

Vehicle Will Not Change Power Mode - DTC B097B

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

DTC Descriptors

DTC B097B 00: Power Mode Start Switch Circuit Malfunction

DTC B097B 02: Power Mode Start Switch Circuit Short to Ground

DTC B097B 04: Power Mode Start Switch Circuit Open

DTC B097B 05: Power Mode Start Switch Circuit High Voltage/Open

DTC B097B 08: Power Mode Start Switch Circuit Performance - Signal Invalid

DTC B097B 61: Power Mode Start Switch Circuit Stuck

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Signal - Terminal 3

B097B 02**

B097B 05**

B097B 05**

-

Signal - Terminal 6

B097B 02*

B097B 04*

B097B 04*

-

Low Reference

-

B097B 05**

--

--

Ground

--

B097B 04*

--

--

* DTC set in body control module

** DTC set in keyless entry control module

Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicate 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

B097B 00

    • The voltage seen at the BCM monitored switch does not match the voltage seen at the keyless entry control module monitored switch.
    • The above condition exists for more than 1 second

B097B 02

    • The control module detects a short to earth in the vehicle ON/OFF switch signal circuit
    • The above condition exists for more than 1 second

B097B 04

    • The control module detects a open in the vehicle ON/OFF switch signal circuit
    • The above condition exists for more than 1 second

B097B 05

    • The control module detects an open in the vehicle ON/OFF switch signal circuit
    • The above condition exists for more than 1 second

B097B 08

    • The control module detects a change in the ignition mode without observing a switch press
    • The above condition occurs 4 consecutive times

B097B 61

    • The control module detects a continuously closed vehicle ON/OFF switch
    • The above condition exists for more than 1 minute

Action Taken When the DTC Sets

No action is taken.

Conditions for Clearing the DTC
    • A current DTC clears when the malfunction is no longer present.
    • A history DTC clears after 40 consecutive module ignition cycles without a repeat of the malfunction.

Reference Information

Schematic Reference

Power Moding Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

    •  Power Mode Description and Operation
    •  Keyless Entry System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Verify DTC B097B 08 or B097B 61 is not set.
    2. ⇒If either DTC is set, test or replace the S83 vehicle ON/OFF switch.
  2. With the brake pedal released, press and hold the S83 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. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Vehicle OFF, test for less than 10 Ω between the low reference circuit terminal 7 and earth.
    4. ⇒If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K84 keyless entry control module.
  4. Verify the scan tool BCM Push Button Ignition Switch Voltage parameter is greater than 11 V.
    5. ⇒If less than the specified range, test the signal circuit terminal 6 for a short to earth. If the circuit tests normal, replace the K9 body control module.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 6 and earth. Verify the scan tool BCM Push Button Ignition Switch Voltage parameter is less than 1 V.
    6. ⇒If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
  6. Connect the harness connector at the S83 vehicle ON/OFF switch.
  7. With the S83 vehicle ON/OFF switch released, verify the scan tool BCM Push Button Ignition Switch Voltage parameter is 8-10 V.
    8. ⇒If not within the specified range, test or replace the S83 vehicle ON/OFF switch.
  8. With the S83 vehicle ON/OFF switch pressed, verify the scan tool BCM Push Button Ignition Switch Voltage parameter is 4-7 V.
    9. ⇒If not within the specified range, test or replace the S83 vehicle ON/OFF switch.
  9. Disconnect the X1 harness connector at the K84 keyless entry control module.
  10. Vehicle OFF, test for infinite resistance between the signal circuit terminal 11 and earth.
    11. ⇒If not the specified value, test the signal circuit for a short to earth.
  11. Vehicle in Service Mode, test for less than 1 V between the signal circuit terminal 11 and earth.
    12. ⇒If greater than the specified range, test the signal circuit for a short to voltage.
  12. With the S83 vehicle ON/OFF switch pressed, test for 4.5-5.5k Ω between the signal terminal 11 and the low reference terminal 12.
    13. ⇒If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the S83 vehicle ON/OFF switch.
  13. With the S83 vehicle ON/OFF switch released, test for 1-1.5k Ω between the signal terminal 11 and the low reference terminal 12.
    14. ⇒If not within the specified range, test or replace the S83 vehicle ON/OFF switch.
  14. If all circuits test normal, test or replace the K84 keyless entry control module.

Component Testing
  1. Vehicle OFF, disconnect the harness connector at the S83 vehicle ON/OFF switch.
  2. With the S83 vehicle ON/OFF switch released, test for 4.5-5.5k Ω between the terminal listed below:
    3. • Signal terminal 4 and low reference terminal 6
    • Signal terminal 3 and low reference terminal 7
    ⇒If not within the specified range, replace the S83 vehicle ON/OFF switch.
  3. With the S83 vehicle ON/OFF switch pressed, test for 1-1.5k Ω between the terminal listed below:
    4. • Signal terminal 4 and low reference terminal 6
    • Signal terminal 3 and low reference terminal 7
    ⇒If not within the specified range, replace the S83 vehicle ON/OFF switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

    •  Ignition and Start Switch Replacement
    • Control Module References for BCM or keyless entry control module replacement, programming, and setup
   


&#169© Copyright Chevrolet. All rights reserved