Code
B1A6B
LAND ROVER
B — Body
Failure in the module right mirror control
Views:
UK: 2
EN: 7
RU: 2
AI status
Completed
Completed
100%
Causes
- Corroded or loose connector at right mirror control module
- Open/short in mirror power or ground circuits
- Failed right mirror control module (internal electronics)
- Water ingress or damage to mirror assembly
- Blown fuse or poor fuse connection feeding mirror module
- Loss of CAN or LIN communication between mirror module and body/BCM
Symptoms
- Right exterior mirror does not adjust or fold
- Mirror heating or demist function inoperative for right side
- Turn signal, puddle lamp or approach lighting in mirror may not work
- Mirror position may be incorrect or stuck
- Warning message or diagnostic trouble code present for right mirror module
- Intermittent operation or operation only when harness is moved (wiring fault)
What to check
- Retrieve all stored and pending DTCs and freeze-frame data with a diagnostic scan tool
- Inspect right mirror and door harness for corrosion, water ingress, physical damage or crushed wires (especially at door hinge/bellow)
- Check fuses and relays related to mirror power in passenger compartment fusebox
- Visually inspect connector pins at the mirror for bent/corroded pins and ensure secure mating
- Check for signs of recent software updates or module replacements that may require coding/programming
- Perform wiggle test on harness while observing live data for the mirror module in a scan tool
Signal parameters
- Module supply voltage with ignition on: battery voltage (~11–14 V) at mirror module power pin
- Ground continuity: near 0 Ω between mirror module ground and chassis ground
- CAN bus idle voltages (if used): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both ~2.5 V at rest); differential activity when messages present
- LIN bus (if used) idle: pulled high toward battery voltage; dominant states drive low during communication
- Mirror motor coils: low-ohm range (ohms-level) — expect low resistance; heater element: higher but still low-to-moderate resistance depending on design (consult vehicle-specific values)
- Expected current draw when operating motors/heater: measurable in-vehicle; excessive current may indicate a shorted motor/heater
Diagnostic algorithm
- Connect a compatible diagnostic scan tool, record DTCs, freeze frame and live data for right mirror module and related modules (BCM). Note any communication faults (U-codes) present.
- Perform a visual inspection of the mirror assembly, connector and door harness (pay attention to hinge/bellows area). Look for corrosion, water, broken wires, pin damage or foreign objects.
- Check fuses/relays that supply the mirror module. Verify fuse continuity and correct fuse rating. Replace or reseat as required.
- With ignition ON, backprobe the mirror module power and ground pins at the connector. Verify battery voltage at power pin and good ground continuity. Repair wiring or ground if out of spec.
- Check communication lines: verify CAN or LIN signals present at the mirror connector with a scope or multimeter where appropriate. If bus messages are absent, trace to BCM/module that provides the bus.
- Wiggle harness and connectors while watching live data and observing symptoms; look for intermittent connections.
- Measure resistance of mirror motors and heater element (where accessible) to check for open/short conditions. Compare to vehicle-specific values when available.
- If motor/element wiring and power are good but module does not respond, try resetting/clearing codes and re-test. If behavior persists, consider bench-testing or replacing the mirror control module. Check for required programming or coding after replacement.
- If U-codes or BCM communication faults are present, investigate upstream modules and the vehicle data bus for shorts/opens or loss of reference voltage before replacing mirror module.
- After repair, clear codes and test all mirror functions over several cycles and road test to confirm repair.
Likely causes
- Water ingress into mirror causing connector/circuit corrosion
- Intermittent or broken ground at mirror module
- Damaged harness between door and mirror (pinched at hinge/bellows)
- Failed mirror control module electronics
- Loss of CAN/LIN bus messages from Body Control Module
Fault status
Status
Right mirror control module fault detected — check power, ground, connector integrity and communication bus; module may be damaged or not communicating.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
1
Land Rover Defender Workshop Manual 1999-2002 MY
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email