Vehicle Platform: OSPREY / AMP ECU Name: PEPS DTC Troubleshooting Data Version: 1.2 Date: 29 Mar 2017 Author: Rajasekhara Reddy Page: 196 of 369 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. B1642 – 12:- Brake Switch– Short to Battery Overview:- ISO Code (DTC Code) B1642 – 12 Customer Symptom 1. Passive vehicle starting will not work only clamp state will change from OFF/ACC/IGN in AT/AMT. Fault Effects (On Vehicle) 1. Passive vehicle starting will work without brake pedal press in AT/AMT. 2. Passive vehicle starting will not work only clamp state will change from OFF/ACC/IGN in AT/AMT. Lamp Status (If Any) N.A. Fault Detection Condition 1. Permanent short circuit to battery of brake signal of brake switch. 2. Wire cut & shorting to battery of Connector-2 / Pin-2 signal. 3. Bending of pin-2 of connector-2 and shorting to adjacent pin. Normal Operating Condition 1. Vehicle battery voltage shall be normal. 2. Brake pedal shall not be pressed continuously for more than 3 min. 3. Valid paired UID should be present inside the vehicle, brake pedal press and SSB should be pressed. Probable Trouble Area 1. Permanent short circuit to battery of brake signal of brake switch. 2. Wire cut & shorting to battery of Connector-2 / Pin-2 signal with vehicle body. 3. Bending of pin-2 of connector-2 and shorting to battery. Healing Condition 1. After fixing short to battery fault on brake signal of brake switch, passive vehicle start should work normally. Table43:- B1642-12 overview details Component Details:- 1. Clutch sensor 2. PEPS ECU Preliminary Checks:- 1. Check vehicle battery voltage, it should be normal. 2. Check ECU pins for oxidation, bending or damage.
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