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Vehicle Platform: OSPREY
ECU Name: Hella Body Control Module (BCM) DTC
Troubleshooting Data
Version: 1.4
Date: 15 May 2018
Author: Body CoC
Page: 311 of 855
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TATA MOTORS Ltd.
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B2239 – 23: Rear Fog Lamp Control Switch – Signal Stuck Low
Overview:
ISO Code
B2239 - 23
Customer Symptom
Rear fog lamp does not operate.
Fault Effects (On Vehicle)
1. Rear Fog lamp will not come ON
2. Facia Switch illumination for rear fog lamp will
not turn ON
Lamp Status (If Any)
Always OFF
Fault Detection Condition
This fault gets logged by BCM; if signal stuck low
condition is detected for rear fog lamp switch.
Normal Operating Condition
If the IGN is ON and headlamps / position lamps are ON
and front fog lampsare ON the rear fog lamps shall turn
ON immediately after pressing the rear fog lamp switch.
Probable Trouble Area
1. BCM connector Fault
2. Rear fog lamp switch input wire Short to ground
from cockpit wiring harness
3. Switch damaged or stuck
4. Facia Switch connector fault.
5. BCM ECU fault
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Rear fog lamp switch is part of facia switch bank. If the IGN is ON and headlamps / position lamps are
ON, Front fog lamps are ON and user presses the rear fog lamp switch then rear fog lamps will turn
ON.
Preliminary Checks:
1. Check Battery Voltage (12.5 V & above)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-