Control Unit/Simulation - Rear Wheels - BMW 745i Repair Instructions

1
BMW '7' series car
ASS control unit No.
07 ABS
Control unit/simulation - rear wheehls
U
(Voltage) betw. ' l eads
1
and
10
Valve front left front right rear left
Pressure -buildup
<
0.1
<
0.1
<
0.1
-
- -
left -drop:
<
0.1
<
0.1 4.5 ... 5.7
-
- -
-retention:
<
0.1
<
0.1
1.9 ... 2.3
-
- -
right -drop:
<
0.1
<
0.1
4.5' ... 5.7
-
-
-
·retention:
<
0.1
<
0.1
1.9 ... 2.3
-
-
Test
sequence:
1. Connechons needed: T·plug at ABS harness and at ABS control unit
2. Switch on ignition; note voltage between leads 1 and 10
02651'00002
>
10.8 V
rear ri, g ht
:c
0.1 A
4.5 ... 5.7 A
1.9 ... 2.3 A
4.5 ... 5.7 A
1.9 ... 2.3 A
3. ABS tel Uale lamp goes out and pre ssure build·up values appear (app. 4 s)
4. Next , press the
~
key; values appear for pressure drop and retention at rear left
5.
Press the ~
key again; values appear for pressure drop and retention at rear right
6. Compare with nominal values
If
nominal values are not reached: check battery, test steps 02104105 , hydro·aggregate, defective ABS control unit
Further inlormation on workshop manual microfiche, Group 34, job Nos. 34 52 510 , 3451 520
J