Code
B1632
Other
B — Body
Mirror Driver Left Circuit Open
AI status
Completed
Completed
100%
Causes
- Blown fuse or fusible link feeding mirror circuit
- Disconnected, corroded or bent connector at the left mirror or door harness
- Broken wire in the door hinge/boot area (flex point) or inside door
- Failed mirror motor/driver module or heater element inside mirror
- Faulty mirror control switch or body control module (BCM)
- Water ingress or corrosion in mirror assembly
Symptoms
- Left exterior mirror will not adjust (no movement) or will not fold
- Mirror heater (if equipped) not functioning on left side
- Intermittent operation or only works when door is positioned certain ways
- DTC B1632 stored and a corresponding message or warning may appear
- No voltage present at mirror connector when switch operated
What to check
- Retrieve freeze-frame/related codes and confirm B1632 is current or history
- Visually inspect fuse(s) and fusible links for the mirror circuit
- Inspect door harness boot for broken wires at hinge; look for pinched/chafed wiring
- Inspect and disconnect left mirror connector; check for corrosion, bent pins and water
- Measure battery voltage at the mirror power pin while operating switch
- Measure continuity/ resistance from mirror connector to the BCM/switch connector
Signal parameters
- Expected supply voltage at mirror power pin: ~11–14 V with ignition/accessory on and switch operated
- Expected ground continuity: near 0 ohms to chassis ground;
- Motor/resistor expected range: typically a few ohms to tens of ohms (varies by design) — check service data
- No signal/voltage (open circuit) when DTC B1632 is active
- Intermittent voltage when wiring is broken or connector is intermittent
Diagnostic algorithm
- Verify code: read ECU/BCM for B1632 and any related body or mirror codes. Note conditions when stored.
- Check fuses: inspect and replace any blown fuses protecting mirror circuits.
- Visual inspection: remove interior door trim if needed. Inspect wiring through door boot for broken wires and connector condition at mirror and switch.
- Backprobe power and ground at mirror connector while operating mirror switch. Confirm battery voltage on power feed and good ground.
- Continuity test: with battery disconnected, check continuity between mirror connector pins and BCM/switch pins. Repair any open/high resistance runs.
- Bench test mirror assembly: apply fused 12 V directly to motor/heater leads to confirm mirror assembly operation. Replace assembly if it does not operate.
- If mirror assembly tests good and wiring is intact, test the mirror switch and BCM outputs for proper operation. Use a scope or DVOM to confirm switching signals.
- Repair found wiring damage, clean/replace corroded connectors, replace faulty mirror motor/module or switch as needed. Clear codes and retest operation over several cycles.
- If fault returns after repairs and wiring confirmed, consider BCM or mirror control module replacement per manufacturer procedures.
Likely causes
- Open or high-resistance power feed to left mirror (broken wire at hinge)
- Open or high-resistance ground at mirror assembly
- Damaged connector pins or corrosion at mirror or door harness
- Internal failure of mirror actuator/driver module
- Faulty mirror switch or BCM output circuit
Fault status
Status
Open circuit detected in left mirror driver — no continuity/voltage detected between control module/switch and left mirror assembly.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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