
		Abbreviations

OBD - Onboard diagnostics

WABCO ATR Exclusive (ATC)

Read out fault memory

Prerequisites:

Vehicle at standstill
Turn system selector switch to heating-ventilation-climate control (HLK) position (see electrical key)
Drive switch on (drive switch to step 2, drive position)

Fault output via display on control panel:

Hold down check key (red) for at least two seconds

Note:

The ATR system comprises the control panel for the passenger compartment and six or seven substations (seven only with Vario-Comp¹). Each control unit has a separate fault memory. The alphanumeric position to the far right of the display shows which control unit has sent the indicated fault (addresses 1, 2, 3, 4, 5, 6, E or F).
Use the "+" key on the control panel to scroll through the individual fault memories.

Address assignment:

Address	Control equipment connector	Control range
1	1 A 32	Footwell area front, water valves, temperature sensors
2	1 A 31	Footwell area rear (climate control system without Vario-Comp¹), water valves, temperature sensors
3	1 A 29	Ceiling left, water valves, temperature sensors and blower
4	1 A 28	Ceiling right, water valves, temperature sensors and blower
5	1 A 33	Climate control system (only with Vario-Comp¹)
6	1 A 30	Entrance 2, water valve, temperature sensor, tailgate damper blower (replacement substation)
E	Driver's seat control panel	Driver's seat/hot water supply
F	Passenger compartment control panel	Master computer

¹ electronic speed control for the coolant compressor

Explanation of display indications

	a)	Indication example: No fault on control unit 1.

	b)	Indication example: Control unit 2 is reporting no current faults, but has stored a fault (missing segment in segment bar at lower edge of display; in the example, this is segment no. 6)

	c)	Indication example: Control unit E is reporting a current fault (80 = driver's seat water valve).


Clear fault memory

	Press and hold down the check key with the drive switch at off, switch on the drive switch (step 2, drive position), release the check key after at least two seconds.
Note:	All fault memories (for the eight control units) will be cleared.