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1、 Cars Comfort for this purpose, after turning off the engine, turn the key briefly to position 2 “Ignition ON“ in the EIS and then remove the key. - Quiescent current switch must not open during the test, therefore both batteries must have a minimum voltage of 12.2 Volt. 3. Carry out the quiescent c
2、urrent test on the ground cable of the on-board electrical system battery with a current clamp or a multimeter. Quiescent current 2.53A: bus keepawake event 1) Isolate active CAN system (e.g. by measuring the voltage drop at fuses and separating the intermediate gateways) 2) Identify Bus keepawake c
3、ontrol unit (e.g. successively disconnecting/connecting the control units at the CAN voltage distributor) Quiescent current 2.53A: local control unit problem (without bus activity) or MOST ring (telematics) active. Check all the circuit 30 and 30g fuses at the front and rear SAM, left front and righ
4、t front fuse boxes (e.g. by measuring the voltage drop at the fuses) 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical Block 2 On-board Electrical System W221 Exercise 1 7 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equip
5、ment Run Exercise Catalog Practical Block 2 On-board Electrical System W221 Exercise 2 8 Practical Block 2 On-board Electrical System W221 Exercise 2 15.02.2008 W221 exterior lights are continuously on, cockpit button group defective Practical exercises in the workshop Customer complaint: Exterior l
6、ights cannot be switched off. Try to find the reason for the malfunction using the Star Diagnosis/WIS! Remedy the existing fault! Note down the procedure and the work steps! ? ? ? ? ? ? ? ? ? 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical B
7、lock 2 On-board Electrical System W204 Exercise 1 9 Practical Block 2 On-board Electrical System W204 Exercise 1 15.02.2008 Practical exercises in the workshop Engine does not start. Various messages in the instrument cluster: ESP, airbag, cruise control. Try to find the reason for the malfunction u
8、sing the Star Diagnosis/WIS! Remedy the existing fault! Note down the procedure and the work steps! ? ? ? ? ? ? ? ? ? ? ? 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical Block 2 On-board Electrical System W204 Exercise 2 10 Practical Block 2
9、 On-board Electrical System W204 Exercise 2 15.02.2008 Practical exercises in the workshop When switching on the ignition, 2 fault messages briefly appear in the display of the instrument cluster. Try to find the reason for the malfunction using the Star Diagnosis/WIS! Remedy the existing fault! Not
10、e down the procedure and the work steps! ? ? ? ? ? ? ? ? ? ? ? 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical Block 2 Air Conditioning W221 11 Practical Block 2 Air Conditioning W221 15.02.2008 As an alternative, description of fault in air
11、 conditioning Practical exercises in the workshop Customer complaint: The temperature control of the air conditioning system is not OK. Try to find the reason for the malfunction using the Star Diagnosis/WIS! Remedy the existing fault! Note down the procedure and the work steps! ? ? ? ? ? ? ? ? ? ?
12、02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical Block 2 Air Conditioning W204 12 Practical Block 2 Air Conditioning W204 15.02.2008 Practical exercises in the workshop Customer complaint: The temperature control of the air conditioning syste
13、m is not OK. Try to find the reason for the malfunction using the Star Diagnosis/WIS! Remedy the existing fault! Note down the procedure and the work steps! ? ? ? ? ? ? ? ? ? ? 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical Block 3 DAS FBS
14、3 Central Locking W221 13 Practical Block 3 DAS FBS 3 Central Locking W221 15.02.2008 Practical exercises in the workshop Customer complaint: The vehicle will not start any more. Try to find the reason for the malfunction using the Star Diagnosis/WIS! Remedy the existing fault! Note down the procedu
15、re and the work steps! ? ? ? ? ? ? ? ? ? ? 02/08 Cars Comfort & Passive Safety Systems Electrical System and Equipment Run Exercise Catalog Practical Block 3 Central Locking - Keyless-Go W221 14 Practical Block 3 Central Locking - Keyless-Go W221 15.02.2008 Practical exercises in the workshop Customer complaint: The vehicle will not start, key cannot be turned in EIS EZS. Try to find the reason for the malfunction using the Star Diagnosis/WIS! Remedy the existing fault! Note down the procedure and the work steps! ? ? ? ? ?
