Ford 2003 Mustang Workshop Manual page 685

Is the battery voltage between 10 and 13 volts with KOEO, and
between 11 and 17 volts with the engine running?
C2 CHECK THE VOLTAGE TO THE ANTI-LOCK BRAKE CONTROL
MODULE
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Key in ON position.
Measure the voltage between anti-lock brake control module C141
Pin 8, Circuit 601 (LB/PK), harness side and ground.
Is the voltage greater than 10 volts?
C3 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE GROUNDS
Measure the resistance between anti-lock brake control module
C141 Pin 12, Circuit 1205 (BK), harness side and ground; and
between anti-lock brake control module C141 Pin 15, Circuit 397
(BK/WH), harness side and ground.
Are the resistances less than 5 ohms?
PINPOINT TEST D: DTC B1484, BRAKE PEDAL INPUT OPEN
CIRCUIT
D1 CHECK THE STOPLAMPS FOR CORRECT OPERATION
Test Step
414-00 .
Yes
GO to C3 .
No
REPAIR the circuit.
CLEAR the DTCs.
REPEAT the self-
test.
Yes
INSTALL a new
anti-lock brake
control module;
REFER to Module
REPEAT the self-
test.
No
REPAIR the circuit
in question.
CLEAR the DTCs.
REPEAT the self-
test.
Result / Action to Take
.