Code
B1707
HUMMER
B — Body
Mirror Switch R Input Shorted to Ground
AI status
Completed
Completed
100%
Causes
- Broken or chafed wiring shorting to chassis ground
- Damaged mirror switch (internal short)
- Water or corrosion in mirror or switch connector
- Poor or missing connector pin retention causing pin contact with ground
- Aftermarket accessories or previous repairs that disturbed wiring
- Short in related control module or internal module fault
Symptoms
- Right side mirror does not respond to switch commands
- Intermittent mirror operation or works only in one direction
- Diagnostic trouble code B1707 stored
- Possible mirror-related warning or reduced functionality
What to check
- Retrieve freeze frame/CID and confirm B1707 is current or stored
- Inspect mirror switch, mirror housing, and door harness for visible damage or corrosion
- Check connector pins for bent, pushed-out or corroded terminals
- Backprobe the mirror switch R input with key ON to measure voltage
- Perform wiggle test of door harness while observing live data or voltage
- Compare readings with left mirror/switch circuit (if available) for reference
Signal parameters
- Key ON, engine OFF: R-input voltage typically ~9–14 V (pulled high) when not actuated; 0 V if shorted to ground
- When switch is actuated the input may change to low (0 V) or toggle depending on circuit design; consult vehicle wiring diagram for expected behavior
- Resistance: between R-input and chassis ground should be very high (open) with switch inactive; low (near 0 Ω) only when intentionally grounded by the switch
- If reading 0 V with switch inactive = likely short to ground
Diagnostic algorithm
- Record codes and live data. Note whether B1707 is current or intermittent and test with mirror switch operated.
- Visually inspect door mirror, mirror glass housing, switch, and harness entry points for damage, water intrusion, or corrosion.
- With ignition ON (engine off), backprobe the mirror switch R-input terminal at the switch connector and at the mirror connector (if separate) and measure voltage relative to chassis ground.
- If voltage is ~0 V with switch inactive, disconnect the mirror connector. If voltage returns to expected level at switch side, fault is in harness/mirror. If still 0 V, fault is upstream (switch or module).
- Perform continuity/resistance check between the R-input wire and chassis ground with connectors disconnected. Low resistance indicates a short to ground in wiring or component.
- Wiggle harness through door jamb while observing voltage/continuity to reproduce intermittent shorts. Pay attention to harness sections at hinge and mirror entry point.
- If wiring appears intact, remove and bench-test the mirror switch or mirror actuator per service manual to confirm internal short.
- Repair damaged wiring (splice, replace pigtail, or replace harness section) or replace faulty mirror/switch assembly as required. Use OEM replacement parts or properly sealed connectors.
- After repair, clear codes and perform function test of mirror. Re-check for any reoccurrence and confirm normal signal parameters.
Likely causes
- Wiring harness abrasion where it passes through the door hinge or near the mirror
- Corroded or bent connector terminal at mirror or mirror switch
- Failed mirror switch internal electronics shorting input to ground
- Water intrusion into mirror assembly causing low-resistance path to ground
Fault status
Status
Right mirror switch input circuit shorted to ground. Mirror may not operate; inspect wiring and switch.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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