Service Information

Cruze

Reading Lamps Malfunction

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.

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Reading Lamps B+	1, 2, 3	1	--	--
Reading Lamps Ground Terminal 6	--	1	--	--
1. Reading Lamps Always OFF 2. Sunshade Lamps Always OFF 3. Instrument Panel Compartment Lamp Always OFF

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Reading Lamps B+

1, 2, 3

Reading Lamps Ground Terminal 6

1. Reading Lamps Always OFF

2. Sunshade Lamps Always OFF

3. Instrument Panel Compartment Lamp Always OFF

The body control module (BCM) supplies the interior/reading lamps, sunshade and Instrument Panel compartment lamp with battery voltage. When switching on the following components the concerning lamps will illuminate:

•	Dome/reading lamps - row

•	Sunshade - left front

•	Sunshade - right front

•	Instrument panel compartment lamp

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, switch the dome/reading lamps or dome/reading lamps - row ON and OFF while observing the lamp. The concerning reading lamp should illuminate when switched ON.

Circuit/System Testing

Reading Lamps Circuit Malfunction

Ignition OFF, disconnect the harness connector at the E37B Dome/Reading Lamps - 2nd Row.
Test for less than 5 Ω between the ground circuit terminal 6 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

Ignition ON, test for greater than 11 V between the circuit terminal 1 and the ground circuit terminal B.

⇒	If less than the specified range, test the 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, test or replace the E37B Dome/Reading Lamps - 2nd Row.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Reading Lamp Bulb Replacement

•	Interior Lamp Replacement

•	Control Module References for BCM replacement, setup, and programming