Code Definition

B1108 (11) — Driver’s Door Ajar Switch Circuit Short to Ground

System: Body  |  Type: Manufacturer-Specific  |  Make: Jaguar

About B1108

B1108 is a manufacturer-specific body diagnostic trouble code recorded for Jaguar vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1108 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1108 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) continuously monitors the driver's door ajar switch circuit for correct voltage levels to determine door open or closed status. The driver's door ajar switch is a plunger type microswitch in the door jamb that pulls the circuit to ground when the door is open, with a pullup resistor inside the BCM holding the line high when the door is closed. DTC B1108:11 is logged when the BCM detects a persistently low voltage (typically below 0.3V) on the driver's door switch circuit for more than 2 seconds while the door is expected to be closed, indicating a short to ground ...

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