AutoCodes – Generic – B3600:07

B3600:07 Code - Passenger Compartment Dimming Request Signal Circuit High Voltage

Quick Answer

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B3600:07 indicates Passenger Compartment Dimming Request Signal Circuit High Voltage.
Common causes: Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 235

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 13, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code B3600:07 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 a low reference, signal, and B+ voltage reference 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 1 and dimming 2 control circuits illuminating the interior backlighting to the requested level of brightness. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a short to voltage in the instrument panel dimmer switch signal circuit.

OBDII Code B3600:07 - Passenger Compartment Dimming Request Signal Circuit High Voltage - AutoCodes.com — B3600:07 Code - Passenger Compartment Dimming Request Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC B3600:07?

Faulty Headlamp Switch
Headlamp Switch harness is open or shorted
Headlamp Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3600:07?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B3600:03 Passenger Compartment Dimming Request Signal Circuit Low Voltage
B3600:07 Passenger Compartment Dimming Request Signal Circuit High Voltage

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3600:07 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.