Service Information

Cruze

DTC B1395

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 B1395 03: Control Module Voltage Reference Output 1 Circuit Low Voltage

DTC B1395 07: Control Module Voltage Reference Output 1 Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Instrument Panel Dimming 12V Reference	B1395 03, B3600 03	B1395 03, B3600 03	B1395 07	--
Instrument Panel Lamps Dimmer Switch Signal	B3600 03	B3600 03	1	--
1. Interior Backlighting Inoperative

The body control module (BCM) supplies a voltage reference through the instrument panel dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the instrument panel lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the instrument panel lamps supply voltage circuit and the LED dimming supply circuit to all related interior lamps, illuminating them to the desired level of brightness.

Conditions for Running the DTC

•	Ignition ON

•	Park lamps ON

Conditions for Setting the DTC

B1395 03

The BCM detects a voltage that is lower than 11.8 V on the instrument panel dimming voltage reference circuit.

B1395 07

The BCM detects a voltage that is greater than 12.2 V on instrument panel dimming voltage reference circuit.

Action Taken When the DTC Sets

Interior lights dimming is disabled. All interior lights are at full intensity.

Conditions for Clearing the DTC

•	The condition for setting the DTC is no longer present.

•	A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

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

Ignition ON, cover the ambient light sensor. Vary the interior lamp dimming switch from dim to full brightness. The lamps should dim and then become fully bright.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
Ignition ON, test for 11.8-12.2 V between the 12 V reference circuit terminal 15 and ground.

⇒	If greater than the specified range, test the 12 V reference circuit for short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

⇒	If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

If all circuits test normal, replace the S30 Headlamp Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Headlamp Switch Replacement

•	Control Module References for BCM replacement, setup and programming