• | 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 |
---|---|---|---|---|
Instrument Panel Lamps Dimming Control | B2652 00 | B2652 00 | B2652 00 | -- |
The body control module (BCM) applies a 12-volt reference voltage through the headlamp and panel dimmer switch 12-volt reference circuit to the headlamp and panel dimmer switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the headlamp and panel dimmer switch through the instrument panel (I/P) lamp dimming switch signal circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamp dimming control circuit and the components on the circuit.
The ignition is ON.
The BCM receives an open, voltage, or ground signal on the I/P lamp dimming control circuit.
The I/P lamps are not illuminated.
• | 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 ON and park lamps ON, vary the headlamp and panel dimmer switch from dim to full bright. The I/P 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 I/P lamp dimming control circuit and for an open in the dimmer switch 5-volt reference circuit. If the circuit/connections test normal, replace the BCM. |
⇒ | 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 replacement, setup, and programming |