Air suspension warning light illuminating circuit system check
1. Air suspension warning light illuminating circuit
system check description of function
The air suspension warning light illuminates for 3
seconds when the ignition switch is set to "ACC" or
"ON" and turns off afterwards. The air suspension control
unit controls the lighting and extinguishing of air
suspension warning light via voltage signal for the meter
when it recognizes the ignition switch "ON" signal.
2. Air suspension warning light illuminating circuit
system check
Inspection when the air suspension warning light does not
illuminate after the ignition switch is turned "ON"
1. Turn OFF the ignition switch.
2. Inspect the fuse.
Note：
・ Inspect the meter power fuse and air
suspension control unit fuse.
3. If the fuse is open circuit, replace it.
Note：
・ If the fuse continues to be open circuit, repair
the cause of open circuits.
4. Install the DMM from the backside of the air
suspension control unit harness connector.
5. Measure the voltage between the air suspension
warning light voltage signal circuit and the frame
ground.
Standard： 1.0 V
6. When the value is at or below the specified value,
replace the meter.
Refer to "9.Body, Cab, Accessories 9E.Instrumentation,
Driver Info.(All models) Instrument panel
cluster removal".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation,
Driver Info.(All models) Instrument panel
cluster installation".
7. After replacement, adjust the speed sensor control
unit.
Refer to "9.Body, Cab, Accessories 9E.Instrumentation,
Driver Info.(All models) Instrument panel
cluster setting".
8. When the value is at or above the specified value,
inspect between the air suspension warning light
voltage signal circuit and the meter harness
terminal.
Note：
・ There should be no power supply short circuit.
・ There should be no short circuit to the ground.
・ There should be no open circuit.
・ There should be no looseness or incorrect
installation of the harness connector
9. If a problem is found, repair it.
10. If a problem is not found, replace the air suspension
control unit.
Refer to "2.Suspension 2C.Rear Suspension(All
models) Air suspension control unit removal".
Refer to "2.Suspension 2C.Rear Suspension(All
models) Air suspension control unit installation".
Functional Inspection (All models) 16C-3
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