Code
B3462
HUMMER
B — Body
Remote Keyless Entry Antenna Circuit Malfunction
AI status
Completed
Completed
100%
Causes
- Damaged or disconnected RKE antenna (external or in-door module)
- Broken, corroded, or shorted wiring or connectors between antenna and BCM
- Poor or missing ground at antenna or BCM
- Blown fuse or loss of supply voltage to the antenna circuit
- Faulty BCM or antenna module
- Water intrusion or corrosion at antenna or connector
Symptoms
- Key fob lock/unlock or remote start does not work or is intermittent
- Passive (walk-up) unlock or keyless entry does not operate
- ‘Key Not Detected’ or RKE related warnings on instrument cluster or infotainment
- Door locks only work with manual key or push-button inside vehicle
- Multiple RKE related DTCs or BCM communication faults
- Increased battery drain in rare cases if circuit shorted
What to check
- Scan vehicle and record all related DTCs and freeze frame data; note BCM and RF/antena related codes
- Check spare/key fob battery and verify fob operation with known-good fob
- Visually inspect antenna(s), harness, and connectors for corrosion, damage, water intrusion, pin push-out, or poor seating
- Verify fuses and power supply to antenna/BCM circuits
- Verify proper ground(s) at antenna and BCM
- Backprobe antenna connector and check for continuity to BCM and expected supply voltage
Signal parameters
- Supply voltage at antenna feed: approx. battery voltage when supply is enabled (verify 11–14 V depending on condition)
- Connector continuity: low ohms between antenna ground and chassis ground; check continuity to BCM signal pin (near 0 Ω to a few ohms for short harness lengths)
- Antenna RF: presence of RF carrier when fob button pressed (vehicle-specific frequency — typically ~315 MHz or ~433 MHz) — requires RF detector/spectrum tool
- No low-impedance short to ground or to battery on signal feed (infinite/very high resistance when inactive)
- CAN/Circuit comms present if BCM must be polled: normal CAN voltages and no bus errors
Diagnostic algorithm
- Connect scan tool, read/record all codes and related modules (BCM); clear codes and attempt to re-produce to confirm persistence.
- Confirm correct operation of the key fob(s) with spare fob and a known-good vehicle (or test bench) to rule out dead/weak fob battery or bad fob.
- Perform a visual inspection of RKE antenna(s) — typical locations: near liftgate, under rear trim, behind dash, or inside mirror — inspect connectors and harness routing for damage or water intrusion.
- Verify fuses and power supply to the antenna/BCM; measure voltage at the antenna connector with ignition in required state (refer to vehicle wiring).
- Check ground(s): measure resistance between antenna ground and chassis ground; repair any high-resistance grounds.
- Backprobe the antenna signal and power pins while pressing the fob to observe presence/absence of RF activity (use RF detector or oscilloscope if available) and verify wiring continuity to the BCM.
- If wiring and power/ground are good, disconnect the antenna and measure for short to ground or supply. Replace antenna module if open or internally damaged.
- If antenna replacement does not cure the fault, check BCM inputs and outputs, verify BCM software level and reflash/reprogram if applicable, or substitute a known-good BCM where supported.
- After repairs, clear codes, cycle ignition and retest all RKE functions from various distances and angles to confirm repair.
- Document findings and advise customer of any key fob replacements or reprogramming performed.
Likely causes
- Corroded connector or pin(s) at antenna or BCM (very common)
- Open or shorted coax/wiring from antenna to BCM due to chafing or replaced trim panels
- Antenna element failed (internal break or water damage)
- Faulty BCM RF input or internal antenna amplifier
- Blown in-line fuse or removable fuse for convenience module
Fault status
Status
Remote Keyless Entry antenna circuit malfunction — open/short/intermittent signal detected between antenna and BCM.
Repair difficulty: Medium
Diagnostic time: 0.5-3 hours
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Repair manuals
Manual library for HUMMER
138
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