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• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Control | B097C 02 | 2 | 1 | -- |
Ground | - | 2 | -- | -- |
1. Vehicle ON/OFF switch indicator always on 2. Vehicle ON/OFF switch indicator inoperative |
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.
Control module voltage is 9-16 V
• | The BCM detects a short-circuit to earth in the control circuit. |
• | The above condition exists for more than 1 minute. |
The BCM disables the control output.
• | 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. |
Power Mode Description and Operation
Control Module References for scan tool information
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.
⇒ | If greater than specified range, test the ground circuit for an open/high resistance. |
⇒ | 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. |
⇒ | 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. |
⇒ | If the LED does not illuminate, replace the S83 vehicle ON/OFF switch. |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for the BCM replacement, programming and set-up |
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