CRUISE CONTROL
B5
CIRCUIT OPERATION
2
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The Cruise Control System can be disabled in one of
four ways:
1.
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$% & %& %" !$*
2. The RES/DECEL Switch is depressed, signalling
the Cruise Control ECU (Z121) to disengage the
system.
3. The brake pedal is depressed, and a vacuum
valve in the Brake Switch Vent Valve opens
(X112). This vents vacuum to the actuator valve
and releases the throttle.
4. The Voltage applied to Cruise Control ECU
(Z121) terminal 9 is interrupted, causing the
Cruise Control ECU (Z121) to turn off the
vacuum pump and de–energise the vacuum
solenoid valve. This voltage path is interrupted
when the brake pedal is depressed, the Clutch
Pedal is depressed, or the vehicle is in Park or
Neutral. With the brake pedal depressed, the
Brake Switch Vent Valve (X112) moves to 1 and
the circuit is interrupted. With the vehicle in Park
or Neutral, the Park/Neutral Position Switch
(X167) energises the Cruise Control Lockout
Relay (K110) by grounding the relay’s coil. The
relay then opens its contacts, interrupting the
circuit. With the clutch pedal depressed, the
Clutch Switch (X200) moves to 1 and the circuit
is interrupted.
NOTE: For 300 Tdi vehicles equipped with an EDC
Diesel engine, the Cruise Control System can also
be disabled by the Engine Control Module (ECM)
(Z132) when an engine fault has been detected.