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DTC B097B

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 02

Power Mode Start Switch Circuit Short to Ground

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

Circuit/System Description

The ignition mode switch has two LEDs that indicate the vehicle power mode. When the vehicle is in the off mode, both LEDs will be off. Pressing the ignition mode switch button once, without the brake pedal applied, will enter the accessory mode and the amber LED will illuminate. Pressing the ignition mode switch button a second time or pressing and holding the ignition mode switch, without the brake pedal applied, will enter the run mode and the green LED will illuminate. With the ignition off and the brake pedal applied, pressing the ignition mode switch button once, the vehicle will enter run/start mode and the green LED will illuminate. This will start the engine.

The keyless entry control module supplies the ignition mode switch a constant B+ signal on the ignition switch run signal circuit. The keyless entry control module monitors this signal to determine the igniting mode. When the ignition mode switch is not pressed, voltage on the signal circuit is pulled down through two resistors in the switch. When the ignition mode switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the keyless entry control module and indicating that the ignition mode switch is pressed.

Conditions for Running the DTC

Voltage supplied to the module is in the normal operating voltage range of 9-16 V.

Conditions for Setting the DTC


B097B 02

• The keyless entry control module detects a short to ground in the respective circuit, when the output is inactive.

• The above condition exists for more than 1 second.



B097B 05

• The keyless entry control module detects a open in the ignition mode circuit

• The above condition exists for more than 1 second.



B097B 08

• The keyless entry control module detects a change in the ignition mode without observing a switch press.

• The above condition occurs four consecutive times.



B097B 61

• The keyless entry control module detects a continuously closed ignition mode 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 when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.


Reference Information

Schematic Reference

Power Moding Schematics

Connector End View Reference

Component Connector End Views

Description and Operation


• Retained Accessory Power Description and Operation

• Power Mode Description and Operation

• Keyless Entry System Description and Operation (without ATH) Keyless Entry System Description and Operation (with ATH)


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 any of the DTCs are set, test or replace the S38 ignition mode switch.

3. With the brake pedal released, press the ignition mode switch once. The amber LED should illuminate and the vehicle should be in the accessory power mode.

4. With the brake pedal released, press and hold the ignition mode switch for 5 seconds. The green LED should illuminate and the vehicle should be in the run power mode.


Circuit/System Testing


1. Ignition OFF, disconnect the X1 harness connector at the K84 keyless entry control module.

2. Ignition ON, test for less than 1 V between the signal circuit terminal 11 and ground.

3. If greater than the specified range, test the signal circuit for a short to voltage.

4. Ignition OFF, connect the X1 harness connector at the K84 keyless entry control module. Disconnect the harness connector at the S38 ignition mode switch.

5. Wait 2 minutes, test for less than 15 Ω between the low reference circuit terminal 7 and ground.

6. 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.

7. Verify that a test lamp illuminates between signal circuit terminal 3 and ground.

8. If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K84 keyless entry control module.

9. If all circuits test normal, test or replace the S38 ignition mode switch.


Component Testing


1. Ignition OFF, disconnect the harness connector at the S38 ignition mode switch.

2. With the button released, test for 4.5-5.5 KΩ between the signal terminal 3 and the low reference terminal 7.

3. If not within the specified range, replace the S38 ignition mode switch.

4. With the button pressed, test for 1-1.5 KΩ between the signal terminal 3 and the low reference terminal 7.

5. If not within the specified range, replace the S38 ignition mode switch.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Ignition and Start Switch Replacement

• Control Module References for keyless entry control module replacement, setup, and programming