Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Service Hints

A20 (A), A21 (B), A22 (C) ABS AND TRACTION ECU
(A) 3, (A) 9, (A)10, (C) 24-GROUND : Always continuity
(B) 6-GROUND : 10-14 Volts with traction cut SW released
(B)11-GROUND : 10-14 Volts with ignition SW at ON position
(B)16-GROUND : 10-14 Volts with stop light SW ON
(B) 4-GROUND : Continuity volts with parking brake lever pulled up (Parking brake SW ON)

A4 (A), A5 (B) ABS ACTUATOR
(A) 1, (A) 2, (A) 4, (A) 5, (A) 6, (A) 7, (A) 8, (A) 9, (A)10, (A)11, (A)12-GROUND : Approx. 1.2 Ohms (Ignition SW OFF)
(B) 1-GROUND : Always continuity
(B) 5-GROUND : 4-6 Ohms (Ignition SW OFF)

S13 STOP LIGHT SW
2-1 : Closed with brake pedal depressed

A8, A9, A31, A32 ABS SPEED SENSOR FRONT LH, RH, REAR LH, RH
1-2 : 0.9-1.3 K Ohms (20° C, 68° F)

P4 PARKING BRAKE SW
1-GROUND : Closed with parking brake lever pulled up