3. Fault table, Table 4-23
Table 4-23
Fault Cause Fault Cause
Totally can not work (can not
self-check)
1.Fault in power circuit
2.Fault in reverse radar
Buzzer does not
work (can
self-check)
1. Fault in buzzer drive
circuit
2. Fault in reverse radar
Sometimes LCD indicator
does not work (can
self-check)
1.Fault in indicator drive
circuit
2.Fault in reverse radar
Open circuit or
freezing indicated
in self-checking
1. Fault in sensor or
sensor influenced by
external environment
2. Fault in sensor circuit
When in reverse gear,
system does not work (can
self-check)
1.Fault in reverse gear
switch circuit
2.Fault in reverse radar
Volume of buzzer is
too low
1. Fault in buzzer drive
circuit
2. Fault in reverse radar
V. Troubleshooting
1. Totally do not work
(1) Check circuit as shown in Fig. 4-115
Fig. 4-115
(2) Check step
1) Disconnect reverse radar probe wire harness connector, check the impedance of foot 3 in the
previous figure and vehicle body, the impedance shall be less than 1Ω.
2) Turn ignition switch to ON, take reverse gear, check the voltage of foot 1 in the previous figure
and vehicle body, the voltage shall be 10-14V. If it is normal, replace reverse radar; if not, proceed
to the next step.
2. Buzzer does not work, check whether it is damaged.
(1) Check circuit as shown in Fig. 4-115
(2) Check step
1) Check whether output signal exists
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