HEADLAMP AUTOMATIC LEVELLING ECU TERMINAL VOLTAGE




Terminal No.
Check items
Check condition
Normal condition
1
Power supply from ignition switch (IG1)
Ignition switch: ON
System voltage
2
Headlamp levelling unit (LH) power supply
Ignition switch: ON
System voltage
3
Output to the headlamp levelling unit (LH)
Ignition switch: ON
When the levelling motor is stopped
0 V
When the levelling motor is operating
10% - 90% of system voltage
4
Headlamp levelling unit (LH) earth
Always
0 V
5
Output of diagnosis signal
At reading of diagnosis code
1.5 V or less
6
Headlamp relay (LO) ON signal
Headlamp: ON
System voltage
7
Output of the pulse check signal
Ignition switch: ON
0 V to System voltage (pulse signal)
8
Output of the headlamp automatic levelling warning display
Ignition switch: ON
Warning display illumination
1.2 V or less
9
Input of vehicle speed signal
Perform a test run of the vehicle.
0 V to System voltage (pulse signal)
11
Headlamp levelling unit (RH) power supply
Ignition switch: ON
System voltage
12
Output to the headlamp levelling unit (RH)
Ignition switch: ON
When the levelling motor is stopped
0 V
When the levelling motor is operating
10% - 90% of system voltage
13
Headlamp levelling unit (RH) earth
Always
0 V
14
Earth
Always
0 V
15
Front height sensor power supply
Ignition switch: ON
5 V
16
Rear height sensor power supply
Ignition switch: ON
5 V
17
Input from front height sensor
Ignition switch: ON
0.5 - 4.5 V
18
Input from the rear height sensor
Ignition switch: ON
0.5 - 4.5 V
19
Front height sensor earth
Always
0 V
20
Rear height sensor earth
Always
0 V