DESCRIPTION AND OPERATION
RANGE ROVER 4.39
Brake Pedal Switch
Fuse 9 of the passenger compartment fuse box (C0586) provides an auxiliary ignition feed
to the brake pedal switch (C0075) on a PY wire. When the brake pedal is pressed, the switch
(C0075) provides the ECM (C0331) a voltage of between 6 V and battery voltage on an NS
wire. When the pedal is released, the switch provides the ECM a voltage of between
approximately 0 and 2 V. Once the ECM registers the brake pedal has been pressed, it will
suspend cruise control operation.
The brake pedal switch (C0075) also provides a test signal to the ECM (C0331) on a UR
wire. The switch (C0075) is earthed on an NB wire.
CAN Bus
When cruise control is activated, the ECM (C0331) informs the automatic transmission ECU
via the CAN Bus on YN (low) and YB (high) wires. The automatic transmission ECU will
change its shift patterns accordingly. For more information on automatic transmission
operation, refer to the Automatic Transmission – ZF 5HP24 or Automatic
Transmission – GM5L40–E section of the System Description and Operation Workshop
Manual, and the Electronic Automatic Transmission – ZF or Electronic Automatic
Transmission – GM5 section of this manual.
+ ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – ZF.
+ ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – GM5.
Rotary Coupler
The rotary coupler (C0082) receives an ignition feed from fuse 9 of the passenger
compartment fuse box (C0587) on a PY wire, and is earthed on an NB wire. The rotary
coupler (C2287) receives voltage pulse messages from the LH steering wheel module
(C2283) as follows:
l A cruise control on/off signal on a W wire.
l A set/accelerate signal on a U wire.
l A decelerate signal on an R wire.
l A resume signal on a B wire.
The messages from the LH steering wheel module are relayed from the rotary coupler
(C0082) to the ECM (C0331) on a YB wire. The ECM interprets this message and controls
the throttle pedal accordingly.
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