B3457

Code

HUMMER B — Body

Right Rear Window Up Switch Circuit Low

Brand: HUMMER

Type: B — Body

Views: UK: 10 EN: 16 RU: 8

AI status

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Page language: EN

Causes

Short to ground on the right rear window up switch wiring
Failed right rear window up switch (internal short or open)
Corroded or damaged connector or terminal at the switch or harness
Water intrusion in door harness or switch assembly
Faulty ground connection or chassis corrosion
Faulty Body Control Module (BCM) input or software fault (less common)

Symptoms

Right rear window will not move up (may still move down or be inoperative)
No response from right rear switch when commanding window up
Intermittent operation or requires pressure/position change to work
Other window switches may still operate normally (problem isolated to right rear)
Possible diagnostic trouble lamp or message related to power accessories

What to check

Scan for stored codes and freeze frame; note if code is current or history and if other related B-codes are present
Visually inspect the right rear door switch, connector, and wiring for damage, corrosion or water
Check fuses and accessory power feeds related to power windows and BCM
Back-probe the right rear window up switch connector with key ON and actuate switch to observe voltage changes
Perform wiggle test of door harness while operating switch to reproduce fault
Measure continuity between switch terminal and BCM input, and check resistance to ground

Signal parameters

Normal expectation: switch input should change state when the 'Up' position is commanded — typically a high (battery) or logic level signal when active depending on vehicle design
‘Low’ condition: measured voltage on the up-switch circuit near 0–1 V indicates a pulled-to-ground/short
Typical thresholds (generic): Low 8–12 V for 12 V systems; some modules use 5 V logic — consult vehicle wiring diagram and service manual for exact values
No-change when actuating switch suggests open circuit, constant low suggests short to ground

Diagnostic algorithm

Clear the code and attempt to operate the right rear window from both the right rear switch and the master switch to confirm repeatability and whether fault is local or shared.
Visually inspect the switch assembly and connector for corrosion, bent pins, water, or foreign material. Repair or replace if obvious damage is found.
With ignition ON, back-probe the up-switch signal pin at the switch connector. Operate the switch up and down and note voltages. If the circuit stays low (≈0 V) when it should go high, proceed.
Check for voltage at the switch power feed and ground. If power is absent, trace and repair power feed or fuse.
If power is present, disconnect the switch and check resistance between the up-switch signal terminal and chassis ground. A near-zero reading indicates a short to ground in the wiring downstream of the switch.
If short suspected, disconnect the connector at the door jamb or BCM and measure continuity between the signal wire and ground to isolate whether the short is in the door harness or body harness/BCM.
Perform a wiggle test on the door harness while monitoring the circuit for intermittent shorts/open circuits. Check the wiring passing through the door boot/grommet for chafing.
If wiring checks good, bench-test or substitute a known-good right rear switch. If the substitute fixes the issue, replace the switch.
If the switch and wiring are good but the BCM still sees a low input, inspect BCM connector pins and grounds; repair harness, pins, or grounds as required.
After repair or part replacement, clear codes and retest window operation multiple cycles to verify repair. If fault persists, consult manufacturer service information for BCM diagnostics and possible module replacement.

Likely causes

Contaminated/corroded switch connector or terminals
Damaged or pinched wiring in door harness causing short to ground
Failed right rear window switch
Water entry into door switch or connector
Loose or corroded ground at door chassis or BCM

Fault status

⚠️ Status

Right Rear Window Up Switch Circuit Low — the BCM detected the Up switch circuit on the right rear door is below the expected voltage threshold (pulled low). This may prevent the window Up command from being recognized.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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