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)

Or, hide this message: temporarily or permanently

Test A: No Communication With The ABS Module

Pinpoint Test A: No Communication With The Anti-lock Brake System (ABS) Module

Normal Operation
The operating voltage required to supply the ABS module, hydraulic pump, and isolation valves is in a range between 10 and 17 volts.

Voltage is supplied by circuit 30-CF6B (RD), circuit 30-CF13 (RD) (power hot at all times) and circuit 20-CF6A (PK/YE) (hot in RUN). Ground is provided through circuit 31-CF6C (BK/YE) and 31-CF6D (BK).

Possible Causes
^ Charging system
^ Battery
^ Ground circuit 31-CF6C (BK/YE) or 31-CF6D (BK)
^ Power supply:
- circuit 30-CF13 (RD) open
- circuit 30-CF6B (RD) open
- circuit 20-CF6A (PK/YE) open
- fuse

A1-A2:




A2: