Perform Function Test Of Trailer Socket - Ar31.19-D-1201-01TS

000 588 00 63 00 Test box

WS82.00-P-0027B

Model 907 

with code Q20 (Trailer hitch (jaw-type)) 

Model 907 

with code Q22 (Trailer coupling, rigid coupling head) 

Model 907 

with code Q24 (Trailer cross member NAFTA, towing capacity 5000Ibs) 

Model 907 

with code Q50 (Trailer coupling with removable ball-type head) 

Model 907 

with code QA7 (Trailer hitch for increased towing capacity 3.5 t) 

Model 907 

with code QA8 (Trailer hitch for increased towing capacity 2.8 t/3.0 t) 

If called for by the findings report for affected component parts during each test step, suitable repair measures are to be conducted to rectify the malfunction.

The following test steps are conducted on a trailer socket 13-pin.

1. Mount test box to trailer socket.

   Use corresponding adapter for 7-pin trailer socket.

2. Switch on ignition.
3. Check left turn signal for proper operation by switching on and off.
4. Check right turn signal for proper operation by switching on and off.
5. Check hazard warning system for proper operation by switching on and off.
6. Check standing light for proper operation by switching on and off.
7. Check backup light for proper operation by engaging reverse gear.
8. Check brake light for proper operation by pressing the brake pedal.
9. Switch on rear fog lamp.

   Only the rear fog lamp on the test box may light up. The rear fog lamp on the vehicle must not light up.

10. Simulate failure of rear fog lamp on trailer.

    The rear fog lamp on the vehicle must light up.

11. Switch off rear fog lamp.
12. Switch on turn signal indicator (left or right).
13. Simulate failure of switched-on turn signal indicator.

    The flashing frequency of the indicator lamp in the instrument cluster must double.

14. Switch off turn signal indicator (left or right).
15. Check 2nd turn signal indicator in similar manner.

    To do so, repeat operation steps  , to  , for 2nd turn signal indicator.

16. Switch off ignition.
17. Check constant voltage connection (tml. 30) to trailer socket.
18. Remove test box (1) and, if used, adapter for 7-pin trailer socket.