B2618
DTC B2618
CIRCUIT DESCRIPTION
The body control module (BCM) controls the following lamps when the instrument panel (I/P) dimmer switch is ON or any door is opened:
- The I/P courtesy lamp, LH
- The I/P courtesy lamp, RH
- The inside rear view mirror lamps
- The cargo lamp
- The roof rail reading lamp, LH
- The roof rail reading lamp, RH
- The sunshade lighted vanity mirror lamps, LH
- The sunshade lighted vanity mirror lamps, RH
The BCM monitors all but the sunshade lighted vanity mirror lamps for a short to ground or a short to battery positive voltage.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2618 Passenger Compartment Dimming Circuit High
CONDITIONS FOR RUNNING THE DTC
Voltage supplied to the module is in the normal operating range, approximately 10-16 volts.
CONDITIONS FOR SETTING THE DTC
- The BCM detects a short to voltage in the courtesy lamps supply voltage circuit of the interior lamps when the dimmer switch is in the ON position or the doors are open.
- The condition is present for more than 3 ms.
ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2618 in memory.
CONDITIONS FOR CLEARING THE MIL/DTC
- A current DTC B2618 clears if the BCM no longer detects a short to battery positive voltage.
- A history DTC B2618 clears after 100 consecutive ignition cycles.
- The BCM receives the Clear Code command from the scan tool.
DIAGNOSTIC AIDS
- If the DTC B2618 is a history DTC, the fault may be intermittent.
- An intermittent short to voltage in the following locations may cause an intermittent malfunction to occur:
- The courtesy lamps supply voltage circuit of the interior lamps
- The BCM
TEST
