1. Remove cable W126, plug P1 (1) from ROADSIDE
DATA PANEL jack J3 (2).
2. Measure resistance between sockets on P1 (1) and pins
on P108 (3) of cable W126 as follows:
Socket A to pin A
Socket N to pin N
Socket B to pin B Socket P to pin P
Socket C to pin C
Socket R to pin R
Socket D to pin D Socket S to pin S
Socket E to pin E Socket T to pin T
Socket F to pin F
Socket U to pin U
Socket G to pin G Socket V to pin V
Socket H to pin H
Socket W to pin W
Socket J to pin J
Socket X to pin X
Socket K to pin K Socket Y to pin Y
Socket L to pin L Socket Z to pin Z
Socket M to pin M Socket a to pin a
3. Does multimeter read 0 ohms for each measurement?
1. Verify no faults found.
1. Replace cable W126
(see your -20).
2. Verify no faults found.