Although a key is used in the normal way to lock and unlock the vehicle, this will not fully arm the engine immobilisation/alarm system. The system is fully armed with an RF handset, which transmits a rolling code. This code is received by the alarm ECU. If a door is opened without the alarm ECU receiving the correct signal from the handset, the alarm will sound. The alarm ECU also informs the engine immobilisation ECU if an incorrect signal is received. In this case, the immobilisation ECU would fail to provide a feed to the starter relay, immobilising the engine.
Passive immobilisation (if fitted) is also a feature, with a passive coil fitted around the ignition barrel. This will activate 30 seconds after the ignition is turned off and the drivers door is opened. Alternatively, passive immobilisation will occur 5 minutes after the vehicle is unlocked, or the ignition is turned off. When attempting to restart the vehicle, passive immobilisation can be switched off using either the RF handset or the EKA code.
The EKA code is entered by the following process;
- With the drivers door closed, insert the key into the ignition switch, turn to position "II" and hold in this position for 5 seconds. Then switch off.
- Turn the ignition switch to position "II" the required number of times to enter the first digit of the code (if the first digit is 4, turn the key to position "II" and then back to "0" four times).
- Open the drivers door (to enter the first digit) and then close the door again.
- Turn the starter switch to position "II" and back to "0" the required number of times to enter the SECOND digit of the code.
- Open the drivers door (to enter the second digit) and then close the door again.
- Turn the starter switch to position "II" and back to "0" the required number of times to enter the THIRD digit of the code.
- Open the drivers door (to enter the third digit) and then close the door again.
- Turn the starter switch to position "II" and back to "0" the required number of times to enter the FOURTH digit of the code.
- Finally, OPEN and CLOSE the drivers door. If the code has been entered correctly, the anti-theft indicator lamp will extinguish and the engine can be started.
NOTE: If the vehicle has been previously armed, and the handset is inoperative, the alarm will sound throughout the EKA entering process.
Operation
Feed from the positive battery terminal is connected to the engine compartment fuse box (C632-1) by a brown wire. Current flows through fusible link 1 and fusible link 2 of the engine compartment fuse box, which are connected in parallel. Fusible link 1 (C907-1) supplies a constant battery feed to;
- The BBUS (C666-2) on a black wire,
- Fuse 21 (C965-1) on a brown wire,
- Pin 86 (C964-30) of the alarm sounder relay on a brown wire,
- Pin 30 (C964-30) of the alarm sounder relay on a brown wire,
- The anti-theft alarm LED (C240-2) on a brown wire.
Fusible link 2 (C907-2) supplies a feed to;
- The ignition switch (C028-1) on a brown wire,
- The starter relay (C151-87) on a brown wire,
- Fuse 1 (C580-1) of the passenger compartment fuse box on a brown wire,
- Fuse 2 (C580-3) of the passenger compartment fuse box on a brown wire.
Alarm
Fuse 21 (C965-2) supplies a constant battery feed to the alarm ECU (C061-25) on a brown wire. The alarm ECU is supplied a permanent earth (C057-11) by a black wire. The alarm ECU (C057-8) also receives a constant battery feed from fuse 1 of the passenger compartment fuse box (C580-2) on a purple wire. This feed is then used to power the hazard warning lamps (C057-1 & C057-6).
When the vehicle alarm has been armed, the alarm ECU receives a number of inputs. The RH door switch (C054-1) is connected to the alarm ECU (C061-5) by a slate/white wire. When the door is closed, the switch is open. In this condition, the alarm ECU (C057-5) supplies the BBUS (C666-3) with battery voltage. When the door is opened, the door switch closes, providing a short to earth. The alarm ECU responds by supplying the BBUS with a reduced voltage. Sensing this drop in voltage, the BBUS sounds.
The same principle is true of the LH door switch and the bonnet switch. The LH door switch (C033-1) is connected to the alarm ECU (C061-16) by a purple/blue wire, and the bonnet switch (C007-2) is connected to the alarm ECU (C061-9) by a orange/blue wire. The bonnet switch is earthed (C007-1) on a black wire. Both interact with the BBUS in exactly the same way as the RH door switch.
In addition to being supplied with a constant battery feed (C666-2), the BBUS also has its own internal power supply, and is earthed (C666-4) on a black wire.
The alarm ECU (C061-20) also provides a feed for the ultrasonic modules (C359-1 & C889-1) on black/brown wires. The modules are earthed (C359-2 & C889-2) on black wires. When the modules detect movement, they supply the alarm ECU (C061-3) with a short series of pulses on a white/black wire. Once the alarm ECU detects these pulses, the BBUS is again sounded.
To disarm the alarm system, the RF handset is used. The signal transmitted by the handset is received by the aerial. The aerial is connected to the alarm ECU (C061-26) by an orange/slate wire. The anti-theft alarm LED is used as a visual deterrent and is connected to the alarm ECU (C057-4) by a pink wire. To illuminate the LED, the alarm ECU provides a path to earth (C057-11). To extinguish the LED, the ECU provides it (C240-1) with a voltage equal to that provided by fusible link 1 . As the potential difference across the LED is now 0 volts, the LED is extinguished. In this way, the ECU can control the flashing sequence of the LED.
The alarm ECU also controls the interior lamps. The ECU (C061-1) provides a feed to the interior lamp unit (C357-1) on a purple/white wire. This informs the lamp unit to extinguish the interior lamps. When the interior lamp unit receives a reduced feed from the alarm ECU, it illuminates the interior lamps.
The alarm and immobilisation systems can be interrogated through the diagnostic socket (C040-8), which is connected to the alarm ECU (C061-17) by an orange/light green wire.
Immobilisation
With the ignition switch in position "II", power flows across the switch (C094-1) and supplies a feed to fuse 20 of the passenger compartment fuse box (C580-39) on a white wire, and to the engine immobilisation ECU (C868-8 & C863-5) on a black wire.
The immobilisation ECU is provided with a permanent earth (C863-1) on a black wire.
Fuse 20 of the passenger compartment fuse box (C580-40) is connected to the alarm ECU (C061-10) by a green wire, the engine immobilisation warning lamp (C961-1) on a green wire, and the BBUS (C666-1) on a black wire. The warning lamp and the BBUS are connected to parallel.
The engine immobilisation warning lamp (C962-1) is connected to the alarm ECU (C057-9) by an orange wire. To illuminate the lamp, the ECU provides an earth (C057-11). To extinguish the lamp, the ECU provides a feed equal to that provided by fuse 20. As the potential difference across the lamp is now 0 volts, the lamp is extinguished. In this way, the alarm ECU can control the flashing sequence of the lamp.
The alarm ECU (C061-14) is connected to the immobilisation ECU (C863-9) by a black wire. The alarm ECU will inform the immobilisation ECU that the alarm system is armed.
When the ignition switch is turned to the "crank" position (C090-1), power flows across the switch to the starter relay (C151-85) on a white/red wire. With the engine immobilised, the alarm ECU (C057-10) provides a feed equal to the ignition feed to the starter relay (C151-86) on a black/orange wire. As the potential difference across the relay coil is 0 volts, the relay fails to energise.
If the engine is mobilised, the alarm ECU withdraws this feed and provides an earth path for the relay. This energises the relay and allows the ignition feed from fusible link 2 of the engine compartment fuse box to flow across the relay (C151-87 & Cl 51-30) and onto the immobilisation ECU (C863-6) on a brown/red wire. When the immobilisation ECU receives an input from the starter relay, it in turn provides a feed to the starter motor solenoid (C179-1) on a black wire. The engine will now start.
The immobilisation ECU also controls the fuel cut-off solenoid (C198-1), which is connected (C863-4) by a black wire. The immobilisation ECU fails to provide the solenoid a feed if the vehicle has been immobilised.
In addition to the features directly controlled by the immobilisation ECU, a passive coil is fitted around the ignition barrel. This is a user friendly way of re-mobilising the engine. The passive coil (C663-1) receives a power supply from the alarm ECU (C057-7) on an orange/green wire.
The passive coil is only energised when the ignition switch is in position "II" and the engine is in an immobilised state. The coil creates a magnetic field that excites a coil in the RF handset. This causes the handset to transmit a code to the alarm ECU to mobilise the engine.
NOTE: For the passive coil to operate correctly, the ignition key and the RF handset must be on the same key ring.
NOTE: Passive immobilisation is not fitted in all markets. Check vehicle specification.