Preparation for DTC Readout

1. Connect Hand-Held Tester (HHT) to data link connector (X11/4) according to connection diagram (see section 0). 2. Ignition: ON 3. Read out DTC memory for ADS control module (N51). 4. If no DTC's are stored, perform electrical test 23.

	Possible cause	Test step/Remedy 1)
-	No fault in system.	In case of complaint: 23 (entire test) and 33
	ADS control module (N51)	Replace N51.
	Battery low voltage, circuit 87	23 1.0
	Battery overvoltage, circuit 87	23 1.0
	Left front VSS signal from traction system control module (N47-1, N47-5), VSS signal status from traction system control module (N47-1, N47-5)	Read out ASR or ESP DTC memory.
	Left front body acceleration sensor (B24/3)	23 4.0
	Right front body acceleration sensor (B24/4)	23 4.0
	Right rear body acceleration sensor (B24/6)	23 4.0
	Front axle level sensor (B22/2)	23 4.0
	Rear axle level sensor (B22/3)	23 4.0
	Steering angle sensor (N49), open/short circuit in sensor, initialization	23 5.0 Turn steering wheel from stop to stop
	Stop lamp switch (S9/1), open/short circuit	Wiring, S9/1
	Left front axle damper valve assembly, front axle solenoid valve 1 (Y51y1), open/short circuit	23 7.0
	Left front axle damper valve assembly, front axle solenoid valve 2 (Y51y2), open/short circuit	23 7.0
	Right front axle damper valve assembly, front axle solenoid valve 1 (Y52y1), open/short circuit	23 8.0
	Right front axle damper valve assembly, front axle solenoid valve 2 (Y52y2), open/short circuit	23 8.0
	Left rear axle damper valve assembly, rear axle solenoid valve 1 (Y53y1), open/short circuit	23 9.0
	Left rear axle damper valve assembly, rear axle solenoid valve 2 (Y53y2), open/short circuit	23 9.0
	Right rear axle damper valve assembly, rear axle solenoid valve 1 (Y54y1), open/short circuit	23 10.0
	Right rear axle damper valve assembly, rear axle solenoid valve 2 (Y54y2), open/short circuit	23 10.0
	Valve (raise front axle) (Y36/6y1), open/short circuit	23 11.0
	Valve (raise rear axle) (Y36/6y2), open/short circuit	23 11.0
	Valve (lower front axle) (Y36/6y3), open/short circuit	23 11.0
	Valve (lower rear axle) (Y36/6y4), open/short circuit	23 11.0
	ADS MIL (A1e27) open/short circuit	23 3.0
	Comfort/Sport switch (S45/1), open/short circuit	Wiring, S45/1
	Level adjustment switch (S77), open/short circuit	Wiring, S77
	Level adjustment switch (S77), lock-out activated
	Vehicle front axle level too low
	Hydraulic fault, Rear axle "lower" valve activation time too long, Hydraulic fault, Front axle "lower" valve activation time too long, Hydraulic fault, Rear axle "raise" valve activation time too long, Hydraulic fault, Front axle "raise" valve activation time too long

1) Observe Preparation for Test, see 22.