20 Most Recent
2011 Buick LaCrosse - Page 5 Questions & Answers
Replace dimmer switch for 2007 Buick Lacrosse
Are you sure you want to do that ? Are you guessing that's the problem ? Do you know what DTC'S - diagnostic trouble code's are ?
DTC B2610
The body control module (BCM) applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp switch. When the switch is placed to the desired position, the dimmed voltage setting is applied from the interior lamp switch through the I/P dimming return circuit to the BCM. The BCM applies the dimmed voltage to the I/P lamps supply voltage circuit.
Do you know how to do electrical testing ?
Reconnect the lamp switch assembly.
Disconnect the body control module (BCM) connector C1.
Using a DMM, measure the resistance between the I/P dimming voltage reference circuit and the I/P dimming control circuit.
Vary the I/P dimming switch from full bright to full dim.
Does the DMM, display change?
Did you perform the Diagnostic System Check - Vehicle?
Yes - Go to Step 2
No - Go to Diagnostic System Check - Vehicle
2
Verify that the interior backlighting does not dim.
Does the interior backlighting operate normally?
Yes - Go to Testing for Intermittent Conditions and Poor Connections
No - Go to Step 3
3
Do the instrument panel (I/P) lamps dim?
YES - Go to Step 13
No - Go to Step 4
4
Do the class 2 lamps dim?
Yes - Go to Step 5
No - Go to Step 6
5
Test for a short to battery positive voltage in the I/P lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Yes - Go to Step 14
NO - Go to Step 13
6
Disconnect the lamp switch assembly.
Does all the illumination of the backlight components turn OFF?
Yes - Go to Step 8
No - Go to Step 7
Not finding what you are looking for?