Vehicle Platform: OSPREY ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 1.4 Date: 15 May 2018 Author: Body CoC Page: 402 of 855 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. B1601 - 12: Bonnet State Switch - Circuit short to Battery or Open Circuit Overview: ISO Code B1601 - 12 Customer Symptom 1. Interior Roof lamp in Auto mode selection doesn’t operate when Bonnet is opened. 2. The IC shows Bonnet as closed status, even if the Bonnet is opened as presumed by the customer. 3. The Mis-lock sound does not occurs on RKE lock command. 4. The vehicle will get lock on RKE lock command. Fault Effects (On Vehicle) Interior Roof lamp in Auto mode selection does not operate when Bonnet is opened. Lamp Status (If Any) 1. Roof lamp in Auto mode selection is OFF. 2. IC shows Bonnet as closed status always Fault Detection Condition This fault will be logged after the input switch test routine execution. User has to operate the switch manually during routine. If short to battery or open circuit fault is detected for Bonnet State Switch, then this DTC code will be returned with the routine results. Normal Operating Condition There should not be any fault returned by routine Probable Trouble Area 1. BCM connector Fault 2. Front side wiring harness Short to battery or open circuit 3. Bonnet State Switch is damaged or stuck or faulty 4. BCM ECU fault Healing Condition 1. Ignition OFF ON 2. Clear DTC Command Component Details: Bonnet State Switch, BCM connector Functionality: If the Bonnet State is short to Battery or Open Circuit, then the Bonnet is in closed state. If the Bonnet is closed, then BCM shall receive the feedback of Bonnet as closed status. Preliminary Checks: 1. Check Battery Voltage (12.5 V & above) 2. Check ECU pins for oxidation, bending & damage. Trouble Shooting:
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