Code
B1A50
LAND ROVER
B — Body
Failure in the mirror switch package Driver
Views:
UK: 2
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty driver-side mirror switch/module
- Damaged or corroded connector or wiring to mirror switch
- Open or short circuit in mirror control circuits
- Poor ground or low supply voltage
- CAN/LIN bus communication fault or module wake-up failure
- Water ingress or physical damage to the mirror assembly
Symptoms
- Driver mirror will not adjust or responds intermittently
- Folding/unfolding function not working for driver mirror
- Heated mirror or puddle lamp not operating on driver side
- Steering column/memory mirror position not stored or recalled
- DTC present in body module and mirror switch module
- Possible warning message or malfunction indicator in vehicle message center
What to check
- Read current and stored codes from all modules using OEM-level scan tool
- Visual inspection of driver mirror, wiring harness and connector for damage, corrosion, or water ingress
- Check that ignition and accessory power are present at mirror connector with key on
- Verify good ground continuity from mirror housing/connector to chassis
- Check CAN/LIN communication status and presence of bus messages for mirror module
- Wiggle-test wiring while monitoring function/scan tool for intermittent faults
Signal parameters
- Battery/supply voltage at mirror connector: approx. 11–14 V with ignition on
- Ground continuity: near 0 Ω between mirror ground pin and chassis ground
- LIN/CAN bus: communication frames present for mirror module when awake (use scope/scan tool)
- Switch/wiper inputs: voltage or resistance change when mirror switch is pressed (manufacturer specs required)
- Motor resistance: left/right/tilt motor coil resistances typically low ohms (measure and compare to reference where available)
Diagnostic algorithm
- Connect an OEM-level scan tool, read and record all codes and freeze frame data from body/comfort modules and mirror module.
- Attempt to reproduce mirror fault and note any conditions (temperature, after wash, intermittent vs permanent).
- Visually inspect mirror assembly and harness for corrosion, moisture, damaged wires, or crushed sections; repair as needed.
- With connector disconnected, inspect pins for corrosion, bent pins or contamination; clean or replace connector if needed.
- Verify supply voltage and ground at mirror connector (key on). If supply or ground out of range, trace upstream to fuse/relay/BCM.
- Check communication: confirm LIN/CAN messages for mirror module using a scanner or oscilloscope. If bus messages are absent, trace bus wiring and check termination/resistance.
- Perform continuity/resistance checks on mirror motor and switch circuits per wiring diagram. Wiggle harness while monitoring to identify intermittent opens/shorts.
- If wiring and power/ground/communication are good, test or replace the mirror switch/module. If replacing, follow manufacturer procedure for coding/programming if required.
- Clear codes and retest all mirror functions; verify no reoccurrence and confirm no dependent faults present.
- If fault persists after mirror assembly replacement, investigate upstream control modules (BCM) and perform module bench tests or dealer-level diagnostics.
Likely causes
- Intermittent or permanent wiring fault at mirror connector (pin corrosion, broken wire)
- Failed mirror switch PCB or internal microswitches
- Poor ground at mirror or BCM causing module fault
- Water ingress into mirror housing causing intermittent shorts
- Faulty communication on LIN/CAN bus between mirror and body module
Fault status
Status
Driver mirror switch/module reported an internal failure or communication error. Mirror control functions on the driver side may be impaired or inoperative.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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