B1773

Code

Other B — Body

Mirror Driver Up Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 20 EN: 34 RU: 23

AI status

Completed

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Page language: EN

Causes

Open or short in the mirror 'up' wiring (broken conductor, pinched cable)
Corroded, loose or damaged connector at the mirror or module
Failed mirror motor/actuator (internal winding open or shorted)
Faulty mirror position/switch or mirror control switch assembly
Faulty body control/door module or mirror control module
Water intrusion or mechanical binding in mirror mechanism causing overcurrent

Symptoms

Mirror will not move upward but may move in other directions
Intermittent operation of mirror up function
Clicking relay noise or blowing fuse when commanding up
Related warning or other mirror-related DTCs present
Mirror stuck in down position or does not respond to switch

What to check

Obtain freeze-frame and active test data with a scan tool, if available
Visually inspect mirror housing and wiring harness for damage, corrosion or pinching
Check relevant fuses and relays for the mirror/door module
Operate mirror up command while observing connector and wiring for movement or noise
Check for water ingress or mechanical obstruction in mirror mechanism
Verify connector pins are seated and free of corrosion

Signal parameters

Supply/command voltage: approx. battery voltage (11–14 V) present at supply feed when mirror is powered
Control method: either switched +12 V or ground, or PWM signal from control module (refer to wiring diagram)
Expected signal when commanding UP: a change (12 V or ground) on the UP control terminal vs. rest position
Typical actuator coil resistance: varies by design (often 1–50 Ω) — high resistance/open indicates winding failure
Actuator current draw: often 0.5–5 A under normal motion; significantly higher when stalled or shorted

Diagnostic algorithm

Read and record DTCs and freeze-frame data with a scan tool; clear codes and attempt to re-create fault
Inspect mirror and wiring harness for physical damage, corrosion, water entry and broken wires—repair as needed
Check fuses and relays related to mirror and door module; replace if blown
Using a multimeter, backprobe the mirror connector while commanding UP: verify supply voltage and the expected control signal (12 V/ground or PWM) at the correct terminal
If no command signal from the module, test continuity from module connector to mirror connector; repair any open/shorts
If command signal is present, disconnect the mirror actuator and apply 12 V directly (briefly) to check motor operation in the UP direction—observe direction and current draw (use an ammeter or clamp meter)
Measure motor coil resistance for opens/shorts; if motor doesn’t run when direct voltage applied, replace mirror actuator
If motor runs when directly powered but not when commanded, test/replace mirror switch or body/door module as indicated by wiring diagram and bench tests
After repairs, clear codes and verify proper operation through multiple cycles and recheck for stored codes

Likely causes

Wiring or connector fault in the mirror up circuit
Failed mirror motor/actuator (does not respond to applied voltage)
Faulty mirror switch or door module not supplying correct control signal

Fault status

⚠️ Status

B1773 — Mirror Driver Up Circuit Failure. Control module detected an open/short or abnormal condition in the mirror UP actuator circuit. Inspect wiring, connectors, fuse, mirror motor/actuator and control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours