The following systems/signals can be activated via the HHT: Status of Radio frequency/Infrared Remote Central Locking (RCL). Convenience Feature (CF) Remote Trunk Release (RTR). Radio frequency signal. Infrared signal. Activation of the turn signal system.

Preparation for Test: 1. Fuses ok, 2. Battery voltage > 11, 3. Side windows open, 4. Ignition: ON 5. After the "Function" Menu in the HHT, the menu point 4 (activation) appears. 6. The following tests are possible via the HHT (see 14/2).

	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
1.0	Status of Radio Frequency/Infrared Remote Central Locking (RCL)		Press F2 Press F3	Vehicle unlocks. Vehicle locks.	23 16.0, 23 17.0, 23 18.0, 23 19.0, 23 20.0, 23 21.0
2.0	Convenience Feature (CF) Opening Model 129 only		Press F2 Press F3	Side windows open. Function is interrupted.	23 17.0, 23 18.0, 23 19.0
3.0	Convenience Feature (CF) Closing Models 129/140		Press F2 Press F3	Side windows open and sliding pop-up roof closes. Function is interrupted.	23 16.0, 23 20.0, 23 21.0
4.0	Remote trunk release Models 129/140		Press F2	Trunk lid opens.	23 17.0, 23 18.0, 23 19.0, Electrical/pneumatic fault in PSE, Trunk lid lock has mechanical fault.
5.0	Radio frequency signal received from transmitter key		Ignition: ON Press button on transmitter key.	(for approx. 2 seconds).	23 1.0, 23 2.0, 23 3.0, Transmitter key, Radio frequency DAS control module (N54/3), DAS radio frequency/infrared control module (N54/4).
6.0	IR signal received by left front door IR receiver (A26/1) Models 129/140 only		Ignition: ON Point second IR transmitter key at (A26/1) and press button.	(for approx. 2 seconds).	23 6.0, 23 7.0, Transmitter key, DAS radio frequency/infrared control module (N54/4).
7.0	IR signal received by right front door IR receiver (A26/2) Models 129/140 only		Ignition: ON Point second IR transmitter key at (A26/2) and press button.	(for approx. 2 seconds).	23 8.0, 23 9.0, Transmitter key, DAS radio frequency/infrared control module (N54/4).
8.0	Activation of turn signal system		Press F2 Press F3	Turn signal system blinks 1x. Turn signal system blinks 3x.	23 10.0, 23 11.0, Version coding incorrect.