Description & Operation
NOTE:
Defender service information is similar to Range Rover service information. Land Rover does not provide Defender specific service information.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
When the park/neutral position switch (X167) is in P or N, ground is applied to the starter solenoid relay (K137). Putting the ignition switch (X134) in position III applies battery voltage to the starter solenoid relay (K137). The starter solenoid relay (K137) energizes and applies battery voltage to the starter solenoid (K136) and starter (M134).
On vehicles equipped with a theft alarm, the theft alarm unit (Z163) provides a ground circuit to the starter solenoid relay's (K137) 86 terminal. If the theft alarm is activated, the theft alarm unit (Z163) will interrupt the starter solenoid relay's (K137) ground path and prevent starting of engine.