Fault code 30: Diagnosis/troubleshooting

FAULT CODE 30 DIAGNOSIS PROCEDURE

Work instruction			Display OK	If not OK
1	Check fuse D6	Check fuse D6	Step 2	Replace fuse D6
2	Check refrigerant pressure		Step 3	Fill system Carry out system testing -> End
2	Check line between relay for fresh-air blower and pressure switch	Switch off ignition Remove plug from pressure switch. Measure voltage at plug of the pressure switch between pin 4 and ground Switch on ignition	Battery voltage Step 3	Step 10
3	Check pressure switch	Measure resistance at the pressure switch between pins 1 and 4	< 5 Step 4	Replace pressure switch Carry out system testing -> End
4	Check line between pressure switch and relay for magnetic clutch	Switch off ignition Disconnect relay for magnetic clutch Reattach the plugs on pressure switch Switch on ignition Measure voltage at relay socket between pin 3 and ground	Battery voltage Step 5	Step 6
5	Check relay for magnetic clutch	Start engine and switch on air-conditioning Measure resistance at relay socket for magnetic clutch between pin 2 and ground Measure resistance at relay socket for magnetic clutch between pin 4 and ground	< 5	Step 9
6	Check line between pressure switch and relay for magnetic clutch for ground short	Remove plug from pressure switch. Measure resistance between plug on transponder coil pin 1 and ground	Step 7	Repair wiring harness -> End
7	Check line between pressure switch and relay for magnetic clutch for open circuit	Measure resistance between plug at pressure switch pin 1 and relay socket for magnetic clutch pin 3	< 5 Step 10	Repair wiring harness -> End
8	Replace relay for magnetic clutch Perform system test		-> End
9	Check line between DME control module and relay for magnetic clutch for open circuit Check line from ground point 8 to relay socket for magnetic clutch for open circuit		-> End
10	Short circuit to ground or open circuit in the lines for relay for fresh-air blower or for pressure switch or relay for fresh-air blower faulty		-> End