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B3600




DTC B3600

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 B3600 03
- Passenger Compartment Dimming Request Signal Circuit Low Voltage

DTC B3600 07
- Passenger Compartment Dimming Request Signal Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides B+, low reference, and signal circuits to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Park lamps ON.

Conditions for Setting the DTC

DTC B3600 03

* The BCM detects a short to ground or an open/high resistance in the instrument panel dimmer switch B+ reference circuit.

* The BCM detects a short to ground or an open/high resistance in the instrument panel dimmer switch signal circuit.

DTC B3600 07

The BCM detects a short to voltage in the instrument panel dimmer switch signal circuit.

Actions Taken When the DTC Sets

The interior backlighting defaults to FULL bright.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics Interior Lights Dimming Schematics

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

Description and Operation

Interior Lighting Systems Description and Operation Interior Lighting Systems

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 Testing

1. Vehicle OFF, disconnect the harness connector at the S16 driver information center switch, vehicle in Service Mode.

2. Verify a test lamp illuminates between the low reference circuit terminal 12 and B+.

• If the test lamp does not illuminate

1. Vehicle OFF, disconnect the X1 harness connector at the K9 body control module, vehicle in Service Mode.

2. Test for less than 1 V between the low reference circuit terminal 12 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If the test lamp illuminates

3. Test for B+ between the B+ circuit terminal 11 and ground.

• If less than B+

1. Vehicle OFF, disconnect the X1 harness connector at the K9 body control module.

2. Test for infinite resistance between the B+ reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the B+ reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If B+

4. Verify a test lamp does not illuminate between the B+ circuit terminal 11 and ground.

• If the test lamp illuminates

1. Vehicle OFF, disconnect the X1 harness connector at the K9 body control module, vehicle in Service Mode.

2. Test for less than 1 V between the B+ circuit terminal 11 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module.

• If the test lamp does not illuminate

5. Verify the scan tool LED Backlight Dimming Command parameter is greater than 40%.

• If 40% or less

1. Vehicle OFF, disconnect the X2 harness connector at the K9 body control module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 10 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module.

• If greater than 40%

6. Install a 3 A fused jumper wire between the signal circuit terminal 10 and the B+ circuit terminal 11.

7. Verify the scan tool LED Backlight Dimming Command parameter is less than 30%.

• If 30% or greater

1. Vehicle OFF, disconnect the X2 harness connector at the K9 body control module.

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

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If less than 30%

8. Test or replace the S16 driver information center switch.

Repair Instructions

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

* Driver Information Display and Multifunction Switch Replacement Driver Information Display and Multifunction Switch Replacement

* Control Module References Programming and Relearning for BCM replacement, programming, and setup

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