B2487

Code

Other B — Body

RF SIDE REPEATER LAMP OUTPUT Ckt Short to Battery

Brand: Other

Type: B — Body

Views: UK: 23 EN: 26 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged wiring harness (chafed, pinched or broken insulation) contacting a fused battery feed
Corroded or bridged terminals in the lamp connector or socket
Faulty or melted lamp/bulb (internal short)
Incorrect replacement lamp (wrong type causing internal short)
Failed BCM/lighting module output transistor
Water ingress in lamp assembly creating conductive path to battery voltage

Symptoms

Right‑front side repeater/indicator may be continuously lit or nonfunctional
Turn signal or hazard functions may not operate correctly on that corner
Possible blown fuse for lighting circuit
Other lighting related faults or erratic behavior on the same circuit

What to check

Visual inspection of RF repeater lamp, connector and wiring for damage, corrosion, or water
Check relevant fuses and fusible links for the lighting circuit
Operate turn signals/hazards while observing lamp behavior and checking for blown fuses
Measure DC voltage at the lamp connector with connector attached and with lamp removed
Check continuity and resistance from the lamp output pin back to the BCM/lighting module
Scan for additional body module codes and attempt to actuate lamp output with a scan tool

Signal parameters

Lamp output voltage (lamp connector pin to ground): Off = ~0 V, On = ~12–14 V (battery voltage)
If shorted to battery: output measures ~12 V even when module output is commanded off
LED repeater current draw: typically
Expected resistance from output pin to battery when shorted: low ohms (
When functioning, module output may PWM for flash — duty cycle and frequency typically 1–2 Hz flash rate, duty ~30–50%

Diagnostic algorithm

Read and record all related fault codes and freeze frame data with a scan tool. Note whether code is current or intermittent.
Perform a visual inspection of the RF repeater lamp assembly, connector and visible wiring for damage, corrosion or water intrusion. Repair obvious damage.
With ignition ON (or as required), command the RF lamp ON/OFF using a scan tool while monitoring voltage at the lamp connector. Note whether voltage is present when commanded OFF.
Disconnect the repeater lamp connector. Recheck voltage at the harness side connector: if ~12 V is present with output commanded OFF, the short is in the harness or module/BCM. If voltage drops to 0 V with connector disconnected, the lamp assembly is likely shorted.
Inspect and measure resistance/continuity between the harness output pin and battery positive (fused side). Low resistance indicates a short to battery. Also check resistance to chassis ground to rule out pins swapped or crossed wiring.
If short is in lamp assembly, remove and bench‑test or replace the lamp; recheck system and clear codes.
If short remains in harness, trace wiring back from connector to the next junctions, looking for chafe points (fender, door hinge, harness grommets). Repair or replace damaged sections.
If wiring appears intact, test/replace the fuseable link/fuse and inspect the BCM/lighting module output. Consult manufacturer repair manual for module bench test or replacement procedure. Do not assume module failure until wiring and lamp are verified good.
After repairs, clear codes, cycle ignition and retest turn signals/hazards to confirm repair. Monitor for recurrence.

Likely causes

Shorted lamp connector or damaged wiring near the front fender or door hinge area
Failed LED lamp with internal electronics shorted to battery
Corroded terminal causing constant feed to the output
Module output damaged after repeated shorts or improper repairs

Fault status

⚠️ Status

RF side repeater lamp output circuit: short to battery detected. Output remains at battery voltage when commanded off or shows an abnormal condition indicating a fault in lamp, connector, wiring, or module output.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours