Vehicle Platform: Zest, Bolt, Tiago, Tigor, Osprey, Q501, X451, Q502 ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 3.8 Date: 17-10-2022 Author: BCM COC Page: 386 of 1202 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. START Connect Diagnostic tool and Run Input Test Routineand operate the switches as ment ioned in the input switch t est routine specification. Is DTC B2218-12 logged by Routine? Disconnect vehicle ba ttery connection. (Please follow the safety guidelines) Check BCM and combi switch connectors fort erminal ba ckout Are connectors loose? 1.Remove BCM Connector. 2.Perform visual check of connectors for pins bentor damaged etc. Is connector faulty? 1.Put combi switch in OFF state. 2.Check continuity between BCM connector pin [C4-11] with battery [C3-2/ C3-1] Continuity Found? 1.Remove Combi Switch mating connector 2. Check continuity between BCM harness sideconnector pin [C4-11] and Auto contact at combi switch Perform thevisual checkof connectors for pin bend or damaged etc. Is connector faulty? Check continuity at combi switch main beam contactwith ground Continuity found? BCM ECU Faulty STOP YES NO YES NO Reconnect connectors firmly Correct connector fault (Terminals Bend) YES NO Correct BCM Side wiringharness (Short to Battery) NO YES Correct connector fault (Terminal Bend) Correct connector fault at combi switch mating connector YES NO YES NO Replace BCM ECU 1. Connect combi switch mating connector 2. Put combi switch at Auto contact 3. Check continuity between combi switch auto contact with ground Continuity found? YES Combi switch fault . Replace combi switch NO Flowchartfor B2218 - 12: Headlamp Auto On Enable Switch - circuitshort to battery
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