Copyright © TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout the consent of author . SRS / Airbag ECU – DTC Troubleshooting Guide Vers ion: 14.0 Da te: 14-February-2017 Prepared by:Airbag COC Review & Approved by:Sanjeev VM Page: 396 of 549 DTC’s confirmation:- After rectification, ensure the following points using TML diagnostic tool before handing over to customer. e) Clear the DTC’s & make sure no DTC’s are present for Airbag system f) Check whether any new DTC’s are getting qualified for repeated cranking. g) Ensure the Airbag Warning Lamp Indication is continuously ON in Instrument Cluster for 4 seconds after Ignition ON h) Ensure the Airbag Warning Lamp Indication goes OFF after 4 seconds from Ignition ON. Circuit Schematic Diagram:- Schematic shown below for illustration Battery>>>>>Fuse>>>>Relay>>>>>>>Sensor/Actuator>>>>>ECU TURN ON IGNITION. CONNECT THE DIAGNOSTIC TOOL AND CHECK FOR DTC’s IS DTC PRESENT? CLEAR DTC IS DTC STILL PRESENT ? 1. TURN OFF IGN, REMOVE DSP SENSOR CONNECTOR FROM VEHICLE W/H. 2. TURN ON IGNITION . CLEAR DTC’s & CHECK FOR DTC’s. IS DTC B 1 00 C - 1 2 PRESENT? REPLACE THE DSP SENSO YES NO NO YES NO YES TURN OFF & ON THE IGNITION & CHECK FOR DTC’s IS DTC PRESENT? NO CHECK WHETHER THE VOLTAGEA T O UT P UT PINS OF W/H W.R.T VEHICLE GROUND IS IN THE RANGE OF 10 TO 12 V STOP RE - CONNECT THE ECU, DSP SENSOR & W/H MODULE IN THE VEHICLE NO YES REPLACE THE DSP SENSOR IS VOLTAGE IS IN 10 T0 12 V? REPLACE AIRBA G ECU WITH A NEW ONE. YES YES NO 1. TURN OFF IGN. REPLACE AIRBAG W/H. 2. CONNECT THE AIRBAG ECU, W/H & DSP IN VEHICLE. 3. TURN ON IGNITION. CLEAR DTC’s & CHECK FOR DTC’s. IS DTC B 1 00 C - 12 PRESENT? START B 1 0 0 C 1 2 . C321B-1& C321B-2
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