Electrical Diagrams

Brake Lights:

WIRING DIAGRAM

Brake Lights - Component Location:

COMPONENT LOCATION
22A Main fuse board in the dashboard.
29 Brake light switch on the pedal assembly.
30 Brake lights in rear light clusters.
109 High-level brake light on tailgate.
258 Connection for trailer lighting.
500 ICE control module
LHD: above main relay board in dashboard
RHD: behind main relay board in dashboard
540 Main instrument display panel on the dashboard.
541 SID unit on the dashboard.

2-pin connectors
H2-1 On LH side of tailgate.
H2-3 In the luggage compartment behind the left-hand wheel housing.

3-pin connector
H3-15 On LH side of tailgate.

4-pin connectors
H4-3 In the luggage compartment behind the left-hand wheel housing.
H4-5 In the luggage compartment behind the left-hand wheel housing.

33-pin connector
H33-1 Grey connector on the bracket below the left-hand A pillar.

Grounding Points
G3 Grounding point, luggage compartment, below left-hand rear light cluster.
G34S Grounding point, control module bracket (Signal) below the right-hand A pillar.

DESCRIPTION OF OPERATION
Pin 2 of brake lights switch 29 is supplied with current via fuse 12.

When the switch is actuated, brake lights 30 receive current via the Integrated Central Electronics (ICE) control module.

The brake lights on a trailer, if any, are supplied with current direct from the brake lights switch via connector 258 (H8-5).

The ICE control module monitors the light bulbs and sends a signal to pin 8 of the SID unit which lights up the "DEFECTIVE LAMP" indicator lamp or the INFO DISPL lamp in the main instrument display panel at the same time as a message is displayed in the SID unit.

On cars for certain markets the SID unit displays a message telling the driver to test the brake lights immediately after switching on the ignition.

The ICE control module also monitors the high-level brake light and senses when more than two light bulbs are defective.


FAULTS DIAGNOSIS HINTS
1. Check that fuse 12 is intact and supplied with current.
2. Check that pin 2 of brake lights switch 29 is supplied with current.
3. Check the connectors, wiring harness and ground connections.

IMPORTANT:
Whenever it is necessary to change any of the light bulbs, always install a bulb of the correct rating. The integrated central electronics control module senses a state of imbalance and lights up the "DEFECTIVE LAMP" indicator lamp or INFO DISPL lamp in the main instrument display panel.