Ford 2003 Mustang Workshop Manual page 3296

Key in OFF position.
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the instrument cluster C220b
pin 2, circuit 12 (LG/BK), harness side and ground, while
turning the high beams on and off.
Is the voltage 0 volts with the high beams off and
greater than 10 volts with the high beams on?
Q3 CHECK FOR CORRECT INSTRUMENT CLUSTER
OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure
they seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?
PINPOINT TEST R: THE ABS WARNING INDICATOR IS NEVER ON
R1 CHECK THE ABS WARNING INDICATOR OPERATION
CAUTION: Use the correct probe adapter(s) when
making measurements. Failure to use the correct probe
adapter(s) may damage the connector.
Key in ON position.
Observe the ABS warning indicator. The ABS indicator
should prove out for approximately six seconds then turn off.
Does the ABS warning indicator operate correctly?
R2 CHECK THE INSTRUMENT CLUSTER INPUT
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C135.
Connect a fused (10A) jumper wire between the anti-lock
brake control module C135 pin 16, circuit 603 (DG), harness
Test Step
Yes
GO to Q3 .
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
INSTALL a new instrument
cluster. REFER to
Instrument Cluster in this
section. TEST the system
for normal operation.
No
The system is operating
correctly at this time.
Concern may have been
caused by a loose or
corroded connector. CLEAR
the DTCs. REPEAT the self-
test.
Result / Action to Take
Yes
The system is operating
normally at this time.
No
If the indicator is
inoperative, GO to R2
If the indicator is always
on, REFER to Section 206-
09A or Section 206-09B
Yes
REFER to Section 206-09A
or Section 206-09B .
.
.