Ford 2003 Mustang Workshop Manual page 684

Is the voltage greater than 10 volts?
A2 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 B: UNABLE TO ENTER SELF-TEST
Test Step
B1 CHECK THE COMMUNICATIONS TO THE
ANTI-LOCK BRAKE CONTROL MODULE
Check the communications to the anti-lock
brake control module.
Does the scan tool communicate with the
anti-lock brake control module?
PINPOINT TEST C: DTC B1318, BATTERY VOLTAGE LOW
C1 CHECK BATTERY VOLTAGE
Measure the battery voltage between the positive and negative
battery posts with the key ON engine OFF (KOEO), and with the
engine running.
Yes
INSTALL a new anti-lock brake control
module; REFER to
self-test.
No
Go To Pinpoint Test A
Test Step
REPEAT the self-
test.
Yes
INSTALL a new
anti-lock brake
control module;
REFER to
REPEAT the self-
test.
No
REPAIR the circuit
in question.
REPEAT the self-
test.
Result / Action to Take
Module . REPEAT the
.
Result / Action to
Take
Yes
GO to C2
No
REFER to
Module .
.
Section