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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 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 an 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

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 Testing
  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.
    ⇓   If none of the DTCs are set
  2. Vehicle OFF, disconnect the X1 harness connector at the K84 keyless entry control module, Vehicle in Service Mode.
  3. Test for less than 1 V between the signal circuit terminal 11 and ground.
    4. ⇒If 1 V or greater
    3.1. Vehicle OFF, disconnect the harness connector at the S38 ignition mode switch, Vehicle in Service Mode.
    3.2. Test for less than 1 V between the signal circuit and ground.
    ⇒     If 1 V or greater, repair the short to voltage on the circuit.
    ⇒     If less than 1 V, replace the S38 ignition mode switch.
    ⇒If less than 1 V
  4. Connect the X1 harness connector at the K84 keyless entry control module.
  5. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S38 ignition mode switch. It may take up to 2 minutes for all vehicle systems to power down.
  6. Test for less than 15 Ω between the low reference circuit terminal 7 and ground.
    7. ⇒If 10 Ω or greater
    6.1. Vehicle OFF, disconnect the harness connector at the K84 keyless entry control module.
    6.2. Test for less than 2 Ω in the low reference circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K84 keyless entry control module.
    ⇓   If less than 10 Ω
  7. Verify that a test lamp illuminates between signal circuit terminal 3 and ground.
    8. ⇒If the test lamp does not illuminate
    7.1. Vehicle OFF, disconnect the harness connector at the K84 keyless entry control module.
    7.2. Test for infinite resistance between the signal circuit and ground.
    ⇒     If less than infinite resistance, repair the short to ground on the circuit.
    ⇓     If infinite resistance
    7.3. Test for less than 2 Ω in the signal circuit end to end.
    ⇒If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒If less than 2 Ω, replace the K84 keyless entry control module.
    ⇓   If the test lamp illuminates
  8. Test or 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
   


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