Brakes - Diagnostic Capability of Slip Control Systems
Group 34Brakes
Bulletin Number
34 05 92 (3692)
Woodcliff Lake, NJ
March 1993
Product Engineering
SUBJECT:
Diagnostic Capability of Slip Control Systems (ABS, ASC and ASC+T)
MODELS:
All so equipped
Situation:
Slip control systems on BMW automobiles are of three types:
ABS - Antilock Braking System
ASC - Automatic Stability Control
ASC+T - Automatic Stability Control + Traction Control
A new range of systems with diagnostic capability are being provided for slip control systems (ABS, ASC and ASC+T) which have until now only been equipped with a limited number of diagnostic functions. These systems have differing self-diagnostic capabilities; therefore, the outline summarizes these varied diagnostic functions. All information contained in current Repair Manual Microfiche and in current Diagnostic Procedures Manuals remains valid.
Notes:
1. A new ABS/ASC test instrument (P/N 90 88 6 345 110) has been developed that allows fault-memory-supported troubleshooting for vehicles which have been equipped with an incomplete self-diagnostic system, or with no self-diagnostic system at all.
2. If a vehicle is test driven with the ABS/ASC tester connected, it must be driven in a safe fashion, such that no adverse effects on handling or stopping distances would occur with ABS/ASC/ASC+T control systems switched off.
3. The maximum permitted speed when carrying out test drives with the ABS/ASC tester connected to E23, E24 and E28 vehicles is 30 mph.
4. After any repairs are performed on any electrical or hydraulic components of the brake control system, the brake system must be checked for proper functioning.
5. When warranty repairs are performed, a copy of the diagnostic printout must be attached to the warranty repair order and a copy must be attached to the Warranty Parts Tag for all parts returned to the Warranty Parts Return Center. This also applies to testing performed with the ABS/ASC tester.
Warranty Status:
Information only.
ABS/ASC Tester Applications