① Disconnect instrument cluster connector.
② After starting engine, take reverse gear, check whether square signal output exists in BCM
(1-19) with oscillograph. If it is normal, proceed to the next step; if not, check whether BCM
controller and probe are damaged.
2) Check wire harness or connector
① Disconnect BCM vehicle body controller connector
② Disconnect instrument cluster connector
③ Check the impedance of BCM vehicle controller sleeve BCM (1-19) and instrument cluster A10,
the impedance shall be less than 1Ω.
If it is normal, proceed to the next step; if not, repair or replace wiring and connector.
3) Check for instrument cluster buzzer does not work
① Turn ignition switch to ON, open one of the four vehicle doors, buzzer shall give off a sound.
② If vehicle speed signal is sent to instrument and wire harness is normal, replace instrument
cluster.
If it is normal, continue other troubleshooting; if not, replace instrument cluster.
3. When in reverse gear, system does not work
(1) Check circuit: see Fig. 4-115
(2) Check step
1) Check reverse radar
① Turn ignition switch to ON, put shift lever from non-reverse gear to reverse gear.
② Test the voltage between BCM (1-8) and vehicle body, the voltage should be over 8V.
If it is normal, check reverse radar probe and BCM controller; if not, proceed to the next step.
2) Check reverse switch
① Disconnect reverse switch wire harness connector.
② Gear to reverse gear and measure the resistance between BCM (1-8) and IG2, if the
resistance is more than 100KΩ while the resistance between reversing switch interface harness
and BCM is less than 1Ω, then the reversing switch is broken, replacement required.
If it is normal, proceed to the next step; if not, replace reverse switch.
3) Check wire harness or connector
Check whether the wire from wire harness of reverse switch interface to BCM is in good
connection.
If it is normal, continue other troubleshooting; if not, repair or replace wiring and connector.
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