Ford Mustang 2005 Workshop Manual page 24

2005 Mustang Workshop Manual
Select the instrument cluster warning lamps and chime active command. Trigger the all lamps active command on
and off. Observe the brake warning indicator.
Does the brake warning indicator illuminate when triggered on and turn off when triggered off?
K3 CHECK THE PARKING BRAKE SWITCH PID
Ignition ON.
Enter the following diagnostic mode on the scan tool: Smart Junction Box (SJB) Parking Brake Switch PID.
Monitor the SJB parking brake switch PID while applying and releasing the parking brake.
Does the PID agree with the parking brake position?
K4 CHECK THE PARKING BRAKE SWITCH (INDICATOR ALWAYS ON)
Disconnect: Parking Brake Switch C306.
Observe the brake warning indicator.
Does the brake warning indicator continue to illuminate?
K5 CHECK CIRCUIT 1309 (RD/YE) FOR A SHORT TO GROUND
Ignition OFF.
Disconnect: SJB C2280c.
Measure the resistance between the SJB C2280c-50, circuit 1309 (RD/YE), harness side and ground.
Is the resistance greater than 10,000 ohms?
K6 CHECK THE PARKING BRAKE SWITCH (INDICATOR INOPERATIVE)
Disconnect: Parking Brake Switch C306.
Connect a fused (5A) jumper wire between the parking brake switch C306-1, circuit 1309 (RD/YE), harness side and
the parking brake switch C306-2, circuit 1205 (BK), harness side.
Does the brake warning indicator illuminate?
K7 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
Ignition OFF.
Measure the resistance between the parking brake switch C306-2, circuit 1205 (BK), harness side and ground.
Is the resistance less than 5 ohms?
K8 CHECK CIRCUIT 1309 (RD/YE) FOR AN OPEN
Disconnect: SJB C2280c.
Measure the resistance between the SJB C2280c-50, circuit 1309 (RD/YE), harness side and the parking brake
switch C306-1, circuit 1309 (RD/YE), harness side.
Is the resistance less than 5 ohms?
K9 CHECK THE SJB OPERATION USING THE DIAGNOSTIC TOOL
Enter the following diagnostic mode on the scan tool: SJB Brake Fluid Level PID.
Ignition OFF.
Disconnect: Brake Fluid Level Switch C124.
Ignition ON.
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Page 24 of 40
No
GO to K14.
Yes
GO to K9.
No
If the PID indicates that the parking brake is always
applied, GO to K4 .
If the PID indicates that the parking brake is never
applied, GO to K6 .
Yes
GO to K5.
No
INSTALL a new parking brake switch. CLEAR the
DTCs. REPEAT the self-test.
Yes
GO to K15.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT
the self-test.
Yes
INSTALL a new parking brake switch. TEST the
system for normal operation.
No
REMOVE the jumper wire. GO to K7 .
Yes
GO to K8.
No
REPAIR the circuit. TEST the system for normal
operation.
Yes
GO to K15.
No
REPAIR the circuit. TEST the system for normal
operation.
Yes
REMOVE the jumper wire. GO to K10 .
No
11/14/2009