Diagnosis

1.	DIAGNOSIS Turn the ignition switch ON, then shift the transaxle lever to 'R'. The Back Warning System is then checked. If no trouble, it generates buzzer alarm sound for 0.3 seconds after 0.5 seconds from power approval.

2.	DIAGNOSIS MODE Switch on diagnosis mode upon system failure. In case of system failure, then it indicates the failed point as follows.

1.	Waveform for a normal sensor connection

2.

Waveform for a failed sensor connection Sensor connection will be checked for oscillating period of input signal 3V. If oscillating period is more than 0.8ms, it is normal. A. Left sensor failure : beep-beep-beep B. Right sensor failure : beep beep-beep beep-beep beep C. Rear-right sensor failure : beep beep beep-beep beep beep-beep beep beep D. Right side sensor failure : beep beep beep beep-beep beep beep beep-beep beep beep beep

1.	Range detected by back sensors is limited. Watch back before reversing

2.	There is a blind spot below the bumper. Low objects (for example boundary barrier) may be detected from minimum 1.5m away unable to detect at nearer.

3.	Besides there are some materials unable to be detected even in detection range as follows. (1) Needles, ropes, rods, or other thin objects. (2) Cotton, snow and other material absorbing ultrasonic wave (for example, fire extinguisher device covered with snow)

4.	Reversing toward the sloped walls.

5.	Reversing toward the sloped terrain.

6.

False alarm may operate in the following condition: irregular road surface, gravel road, sloped road and grass. Upon alarm generation by grass the alarm may be generated by rock behind grass. Always visually check the area behind the vehicle before backing up. The sensors cannot discriminate between materials.

7.

Sensors may not operate correctly in the below conditions. Ensure sensors are clean from mud or dirt (1) When spraying the bumper, the sensor opening is covered with something in order not to be contaminated. If sensor opening is contaminated with mud, snow, or dirt, detection range will be reduced and alarm may not be generated under the crash condition. Dirt accumulated on the sensor opening shall be removed with water. Do not wipe or scrape sensor with a rod or a hard object. (2) If the sensor is frozen, alarm may not operate until sensor thaws. (3) If a vehicle stays under extremely hot or cold environment, the detection range may be reduced. It will be restored at the normal temperature. (4) When heavy cargo is loaded in rear cargo area, it changes the vehicle balance, which reduces the detection range. (5) When other vehicle's horn, motor cycle engine noise, or other ultra-sonic wave sources are near. (6) Under heavy rain. (7) When reversing towards a vertical wall and the gap between the vehicle and the wall is 15cm. (Alarm may sound despite the absence of a barrier) (8) If radio antenna is installed at the rear. (9) If the vehicle rear wiring is re-routed or electrical component is added at the rear part. (10) Vehicle balance is changed due to the replacement of the rear spring. (11) The unit will operate normally when the vehicle speed is 5km/h or less. Above this speed, the unit may not operate normally

8.	Check the rear bumper for installation condition and deformation. If installed improperly or the sensor orientation is deviated, it may cause malfunction.

9.	Be careful not to apply shock during sensor installation on the transmission or reception unit.

10.	When adding electrical devices or modifying harness at the rear body of the vehicle, ensure not to change the transmission and reception unit wiring. Tagging the transmission side and reception side, it may cause malfunction.

11.	High power radio transmitter (above 10W) may cause malfunction. Do not install it on the vehicle.

12.	Be careful that excessive heat or sharp objects shall not touch ultrasonic sensor surface. Do not cover the sensor opening or press the sensor.