B3473

Code

Generic B — Body

Keyless Entry Receiver Circuit Short/Open (Body Control Module)

Brand: Generic

Type: B — Body

Views: UK: 7 EN: 7 RU: 9

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Damaged or corroded connector at keyless entry receiver or BCM
Broken, chafed, pinched or shorted wiring between receiver antenna and BCM (open, short to ground or battery)
Faulty keyless entry receiver or antenna module
Poor or missing power/ground to the receiver (blown fuse, lost ground)
Water intrusion or corrosion at receiver/antenna or connectors
Interference from aftermarket devices or improperly installed alarm/remote systems

Scan vehicle and retrieve freeze-frame / related DTCs; confirm B3473 is current or historic
Visual inspection of receiver/antenna, BCM connectors and wiring for corrosion, damage or water intrusion
Check relevant fuses and fusible links for receiver/BCM power
Verify receiver/antenna module ground and supply voltage with ignition on (multimeter)
Check remote key battery and verify remote transmits (use spare remote if available)
Wiggle test wiring/connectors while operating remote to reproduce fault

Receiver supply voltage: nominal battery voltage ~11–14.5 V with ignition on or as specified by vehicle
Receiver ground: near 0 V (0–0.2 V measured to battery negative under light load)
Signal line behavior: pulsed RF/logic signal when remote button pressed — at the BCM input expect transient voltage changes (vehicle-specific); no continuous high current
Typical continuity: low ohms (1 MΩ or infinite

Record codes and symptoms; verify remote battery and operation from multiple remotes if available.
Perform visual inspection of receiver/antenna and BCM connectors for damage, corrosion, bent pins, or water intrusion; repair as needed.
Check fuses and any fusible links feeding the receiver/antenna and BCM; replace blown fuses and retest.
With ignition on, measure supply voltage and ground at the receiver/antenna connector. Expect battery voltage on Vbatt terminal and near 0 V on ground. If incorrect, trace power/ground to BCM and battery.
Check continuity between receiver connector pins and the BCM pins for the receiver circuit. Look for opens or shorts to ground/battery/chassis.
While monitoring the receiver signal or BCM input with a multimeter or oscilloscope, press the remote and observe for signal pulses. If no pulses and remote is known good, suspect receiver or wiring open.
Disconnect aftermarket alarm/remote devices and retest if present.
If wiring and power/ground are good but no signal, substitute a known-good receiver/antenna (if available) or repair/replace receiver module.
If replacement receiver does not clear the fault and wiring is verified, consider BCM fault; confirm BCM inputs and communications before replacing. Clear codes and road-test to verify repair.
After repair, clear DTCs and verify functionality of keyless entry from multiple remotes and ranges.