1503 / 1906
ELECTRICAL
201
2.2 Illuminated Ignition Switch (Key Hole) – Parallel to Roof Lamp
Description
The key hole shall be illuminated, for better visibility for the driver to insert or remove or change position of
the ignition key. The key slot on the ignition switch is accommodated with a LED. The key hole shall be
illuminated by BCM when the vehicle is unlocked and the driver door/Co-Driver door is opened. The LED
shall stay ON until the predefined time or till sometime after the driver and the co-Driver doors are closed or
until the ignition is made ON.
NOTE:
Refer the ‗Roof Lamp‘ functionality (Section 2.1) as the key hole LED will be connected in parallel
with the roof lamps hence the separate driving of the key hole LED will not be required.
2.3 Cockpit Illumination
Description
BCM controls the back light illumination of all switches on dashboard.
Conditional Requirements
Activation –
Cockpit illumination will be activated by BCM whenever position lamps are active either through manual
switch or through Light sensor (if fitted).
Cockpit lighting intensity will be varied by BCM based on the user input of cockpit dimming wheel analog
input to BCM.
BCM also publishes the dimming setting value on CAN, so that other aggregates like Instrument cluster,
ETC panel takes the CAN message and controls their own backlighting. 'in steps'.
De-activation –
BCM deactivates the cockpit lamps whenever IGNITION and Position lamps are made OFF.
On-Fault –
1. Cockpit lamps won’t turn ON if there is any issue in wiring and/or BCM output.
2. Intensity change is not possible if there is any error in cockpit input to BCM and/or related wiring.
Operating Voltage Range
DESCRIPTION
REQUIREMENT
VOLTAGE
Roof Lamp
Normal voltage range
9V-16V