Code
B2532
HUMMER
B — Body
Front Fog Lamps Control Circuit Low (BCM)
AI status
Completed
Completed
100%
Causes
- Short to ground in the fog lamp wiring or connector
- Open circuit or high resistance in the fog lamp feed or ground
- Burned-out or shorted fog lamp bulb(s)
- Blown fuse or faulty fog lamp relay
- Corroded or loose connector at lamp or BCM
- Faulty BCM output driver or internal module fault
Symptoms
- Front fog lamps do not illuminate
- Fog lamp indicator on dash may be off or show fault
- Fuse for fog lamps may be blown repeatedly
- Intermittent operation of fog lamps
- Other lighting anomalies if BCM output is affected
What to check
- Read freeze frame and stored data with a compatible scan tool; verify DTC and occurrence conditions
- Visual inspection of front fog lamp housings, bulbs, wiring, and connectors for corrosion or damage
- Inspect and test fog lamp fuse(s) and relay (remove and inspect for corrosion or melted contacts)
- Backprobe the fog lamp connector and BCM output with switch ON to measure voltage
- Check continuity and resistance between BCM output, lamp connector, and ground
- Look for aftermarket modifications or recent bodywork near the front wiring harness
Signal parameters
- With fog lamp switch OFF: control circuit should be near 0 V (or BCM default state per service manual)
- With fog lamp switch ON: control circuit output should be near battery voltage (~11–14 V) at the lamp connector
- Lamp filament resistance (cold) should be low (typically a few ohms); open circuit indicates burned filament
- Circuit current draw when ON should match bulb rating (typical automotive lamp current range ~1–7 A depending on bulb)
- If control is a low-side driver: output may be pulled low when activated; consult service manual for BCM driver type
Diagnostic algorithm
- Verify the DTC with a scan tool. Note freeze-frame and any related codes. Clear codes and attempt to reproduce.
- Visually inspect both front fog lamp bulbs and sockets. Remove bulbs and inspect for burned filaments or melted bases.
- Check and test fog lamp fuse(s) and replace if blown. If fuse blows again, proceed to locate short to ground.
- With switch ON, backprobe the fog lamp connector: verify battery voltage is present at the feed and proper control voltage at the lamp side.
- Measure resistance between the lamp positive feed and BCM output; check continuity to chassis ground from the lamp ground circuit.
- Disconnect lamp connectors and measure for short-to-ground on the control feed. If short is present with connector disconnected, trace wiring harness for damage.
- Wiggle test wiring harnesses while observing voltage/scan tool data to find intermittent faults.
- Swap or bench-test the fog lamp relay (if applicable) and substitute a known-good bulb to rule out lamp failure.
- If wiring and lamps test good, backprobe the BCM output and verify driver operation per service data. Compare to known-good BCM or perform module diagnostics per factory procedure.
- Repair or replace damaged wiring, connectors, bulb(s), relay, fuse, or BCM as indicated. Clear codes and verify repair by confirming stable circuit voltage and no DTC return.
Likely causes
- Damaged insulation/chafed wiring contacting chassis ground near lamp
- Corroded lamp connector causing intermittent low voltage
- Failed fog lamp bulb with internal short
- Blown fuse in fog lamp circuit
- Failed fog lamp relay not switching properly
- BCM driver transistor failed (rare) or BCM software/configuration fault
Fault status
Status
Front Fog Lamps Control Circuit Low — BCM indicates the fog lamp output circuit is low (shorted to ground, excessive load, or open/abnormal wiring). Fog lamps may not operate; inspect wiring, bulbs, fuses, relay and BCM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
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138
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Code
B2532
Other
B — Body
Right Rear Backup Lamp Circuit Short to Battery
AI status
Completed
Completed
100%
Causes
- Short to ground in the fog lamp wiring or connector
- Open circuit or high resistance in the fog lamp feed or ground
- Burned-out or shorted fog lamp bulb(s)
- Blown fuse or faulty fog lamp relay
- Corroded or loose connector at lamp or BCM
- Faulty BCM output driver or internal module fault
Symptoms
- Front fog lamps do not illuminate
- Fog lamp indicator on dash may be off or show fault
- Fuse for fog lamps may be blown repeatedly
- Intermittent operation of fog lamps
- Other lighting anomalies if BCM output is affected
What to check
- Read freeze frame and stored data with a compatible scan tool; verify DTC and occurrence conditions
- Visual inspection of front fog lamp housings, bulbs, wiring, and connectors for corrosion or damage
- Inspect and test fog lamp fuse(s) and relay (remove and inspect for corrosion or melted contacts)
- Backprobe the fog lamp connector and BCM output with switch ON to measure voltage
- Check continuity and resistance between BCM output, lamp connector, and ground
- Look for aftermarket modifications or recent bodywork near the front wiring harness
Signal parameters
- With fog lamp switch OFF: control circuit should be near 0 V (or BCM default state per service manual)
- With fog lamp switch ON: control circuit output should be near battery voltage (~11–14 V) at the lamp connector
- Lamp filament resistance (cold) should be low (typically a few ohms); open circuit indicates burned filament
- Circuit current draw when ON should match bulb rating (typical automotive lamp current range ~1–7 A depending on bulb)
- If control is a low-side driver: output may be pulled low when activated; consult service manual for BCM driver type
Diagnostic algorithm
- Verify the DTC with a scan tool. Note freeze-frame and any related codes. Clear codes and attempt to reproduce.
- Visually inspect both front fog lamp bulbs and sockets. Remove bulbs and inspect for burned filaments or melted bases.
- Check and test fog lamp fuse(s) and replace if blown. If fuse blows again, proceed to locate short to ground.
- With switch ON, backprobe the fog lamp connector: verify battery voltage is present at the feed and proper control voltage at the lamp side.
- Measure resistance between the lamp positive feed and BCM output; check continuity to chassis ground from the lamp ground circuit.
- Disconnect lamp connectors and measure for short-to-ground on the control feed. If short is present with connector disconnected, trace wiring harness for damage.
- Wiggle test wiring harnesses while observing voltage/scan tool data to find intermittent faults.
- Swap or bench-test the fog lamp relay (if applicable) and substitute a known-good bulb to rule out lamp failure.
- If wiring and lamps test good, backprobe the BCM output and verify driver operation per service data. Compare to known-good BCM or perform module diagnostics per factory procedure.
- Repair or replace damaged wiring, connectors, bulb(s), relay, fuse, or BCM as indicated. Clear codes and verify repair by confirming stable circuit voltage and no DTC return.
Likely causes
- Damaged insulation/chafed wiring contacting chassis ground near lamp
- Corroded lamp connector causing intermittent low voltage
- Failed fog lamp bulb with internal short
- Blown fuse in fog lamp circuit
- Failed fog lamp relay not switching properly
- BCM driver transistor failed (rare) or BCM software/configuration fault
Fault status
Status
Front Fog Lamps Control Circuit Low — BCM indicates the fog lamp output circuit is low (shorted to ground, excessive load, or open/abnormal wiring). Fog lamps may not operate; inspect wiring, bulbs, fuses, relay and BCM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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