DTC B2628. Saturn VUE

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2006 🢒 VUE - FWD 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B2628

Circuit Description

The body control module (BCM) receives a variable voltage from the instrument panel (I/P) lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the I/P lamps. The I/P dimming lamps output from the BCM is a pulse width modulated (PWM) voltage supply used to light the I/P lamps. If a malfunction occurs in the I/P dimming lamps output circuit, this DTC is set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2628 Display Dimming Pulse Width Modulation (PWM) Output Circuit High

Conditions for Running the DTC

The park lamp input is active (park or headlamps ON).

Conditions for Setting the DTC

Any of the following conditions will set this DTC:

The I/P dimming lamps output is shorted to voltage.

Action Taken When the DTC Sets

If the I/P dimming lamps output is shorted to voltage, the I/P lamps will illuminate at full intensity.

Conditions for Clearing the DTC

•	The conditions for setting the DTC are no longer present.

•	A history DTC clears after 100 malfunction-free ignition cycles.

•	The BCM receives the clear code command from the scan tool.

Diagnostic Aids

If the DTC is a history DTC, the malfunction may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .

Step	Action	Yes	No
Schematic Reference: Interior Lights Dimming Schematics
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn the ignition switch to the ON position. Turn the headlamp switch to the ON position. Attempt to adjust the lighting intensity of the instrument lamps with the dimmer switch. Do the instrument panel lamps vary with dimmer control?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Is DTC B2622 or B2623 set?	Go to DTC B2622 or DTC B2623	Go to Step 4
4	Test for a short to voltage on the instrument panel (I/P) lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 7	Go to Step 5
5	Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 7	Go to Step 6
6	Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 7	--
7	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK