BMW 1992 525i Electrical Troubleshooting Manual page 221

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ANTI LOCK BRAKE SYSTEM (ABS)
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Pin
1\'pe Description/Function Connection 1\'pe of Signal Tester Display Measurement Notes
20 M Ground, control unit
Ground
Ground
21 E Ground
Front right speed sensor
Ground
22
Not used
23
Not used
24
E Speed sensor signal Rear right speed sensor
25
E Brake pedal status Brake light switch
26 E
Ground
Rear right speed sensor Ground
27
A
Valve relay control
Valve relay Ground
28 A Pump relay control Pump relay Ground
29 A Warning lamp control Instrument cluster Ground
(I)
30 A RxD Diagnostic connector
,J::II.
U1
0
31
E TxD Diagnostic connector
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0
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32 E
Display, valve relay Valve relay
D"
33
Not used
34
M Ground, control unit Ground Ground
35 A
Front right solenoid control Front right solenoid valve Ground