• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
LED Dimming Supply | B2610 00 or B2610 02 | B2610 00 or B2610 04 | B2610 00 or B2610 01 | -- |
LED Backlighting Ground | -- | 1 | -- | -- |
1. Interior Backlighting Inoperative |
When the instrument panel lamps dimmer switch is activated, a variable voltage signal is applied through the LED dimmer switch signal circuit to the body control module (BCM). The BCM then applies a message on the low speed GMLAN serial data communication circuit to the door switches to illuminate the switch backlighting. The BCM, driver door switch, and passenger door switch then applies a variable voltage signal through the LED dimming supply circuit to the components on that circuit.
The ignition is ON.
The BCM, driver door switch, and passenger door switch detects a short to voltage, short to ground, or an open on the LED dimming supply circuit.
The BCM, driver door switch, and passenger door switch will cease attempts to dim or illuminate the LED lamps.
• | 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. |
Interior Lights Dimming Schematics
Lighting Systems Connector End Views
Ignition and park lamps ON, vary the interior lamp dimming switch from dim to full bright. The LED lamps should dim and then become full bright.
⇒ | If the DTC resets, test for a short to voltage, short to ground, or an open in the LED dimming supply circuit. If the circuit/connections test normal, replace the BCM, driver door switch, and passenger door switch as applicable. |
⇒ | If the DTC resets, replace that particular component. |
⇒ | If the DTC does not reset, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Refer to the appropriate replacement procedure for the component causing the condition. |
• | Control Module References for BCM, driver door switch, and passenger door switch replacement, setup, and programming |