Rear window defroster diagnosis troubleshooting · ad6729s5000b · Mercedes-Benz WIS

AD67.29-S-5000B

Rear window defroster diagnosis troubleshooting

4.3.98

MODEL 638 as of 1.5.98
with CODE (W51) 180° two-leaf rear door with window
with CODE (W62) Tailgate with window

	Rear window defroster diagnosis, previous knowledge		AD67.29-S-2000B
	Rear window defroster diagnosis, function check		AD67.29-S-3000B
	Troubleshooting
Complaint	Possible cause	Note	Remedy/Test steps
Indicator lamp does not come on after switching on when engine is running	Indicator lamp defective	Check indicator lamp - Ground connection - Actuation	AD67.29-S-6000-02B
	Rear window defroster button Voltage supply	Check button - Continuity through button	AD67.29-S-6000-04B
Indicator lamp comes on, heating element in rear window inoperative	Voltage supply Heating element/rear window Heating element open-circuit	Check heating element - Ground connection - Voltage supply	AD67.29-S-6000-06B
Illumination of rear window defroster button inoperative	Voltage supply Lamp	Check only when other instrument lighting operates properly.	AD67.29-S-6000-07A

ad6729s2000b Rear window defroster diagnosis previous knowledge
ad6729s3000b Rear window defroster diagnosis operational check
ad6729s600002b Rear window defroster test of electrical system warning light
ad6729s600004b Rear window defroster test of electrical system pushbutton
ad6729s600006b Rear window defroster test of electrical system heating element
ad6729s600007a Rear window defroster test of electrical system illumination of rear window defroster switch