Pic. 12.15. Electrical Component Locations for Suspension Damping Control System
1. The electrical circuit consists of a selector switch, a control unit and four actuators mounted on top of each suspension brace.
2. The circuit is powered by the battery through a fusible link and the ignition relay to a fuse (designated "Turn signal/transmission").
3. The control unit is installed under the driver's seat, which must be removed before carrying out work.
4. Each actuator is removed and installed as described in the relevant Chapters.
5. To remove the switch, remove it from the panel and disconnect the electrical wiring.
6. In addition to the light bulb, which turns on whenever the light is on, the switch is equipped with three LEDs.
7. LEDs also act as a self-monitoring control unit. If more than one LED is on or blinking at the same time, check the entire circuit by first checking the battery and all connectors.
8. If all LEDs are known to be in good working order, then turn off the ignition and replace the switch. If the LEDs still do not light up, first check the fuse, then check the power supply to the control box.
9. Check for a break in the harness connecting the control unit 11 clamp (green wire) and land. The criterion for the serviceability of this circuit is the presence of voltage between the terminals of block 1 and 11 (the voltmeter is connected with a negative probe to terminal 11, a positive one to terminal 1 with the ignition on). If there is no voltage, check the wiring harness until damage is found. If power is supplied, the switch is faulty and needs to be replaced.
10. If two LEDs are on, turn off the ignition, and replace the switch, connect the switch to another installation, then turn on the ignition again. If the switch now operates normally, check the wiring.
11. If all three LEDs are lit, turn off the ignition and connect the switch to another installation, then turn on the ignition again. If there is no change, check the switch as described in the previous paragraph, and replace it if it is faulty.
12. If one LED is constantly on and the other two are blinking, then first turn off the ignition and carry out maintenance work on the system in compliance with safety precautions. If the damage is not corrected when the ignition is turned on, then the fault is either in the control unit or one of the actuators.
13. If the damage is in the control unit or one of the actuators, the vehicle must be serviced at a specialized Nissan station. Defective units must be replaced.