Ford Fiesta: Exterior Lighting / Stoplamps. Diagnosis and Testing
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
DTC Chart: BCM
BCM
DTC Chart
BCM
|
Description
|
Action
|
C1A96:24
|
Brake Light Switch: Signal Stuck High
|
GO to Pinpoint Test C
|
Symptom Chart(s)
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
Symptom Chart: Stoplamps
Symptom Chart
Condition
|
Possible Sources
|
Actions
|
A module does not respond to the diagnostic scan tool
|
-
Fuse
-
Wiring, terminals or connectors
-
Module
|
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
|
All the stoplamps are inoperative
|
Refer to the Pinpoint Test
|
GO to Pinpoint Test A
|
One or more stoplamps are inoperative
|
Refer to the Pinpoint Test
|
GO to Pinpoint Test B
|
The stoplamps are on continuously
|
Refer to the Pinpoint Test
|
GO to Pinpoint Test C
|
Pinpoint Tests
All The Stoplamps Are Inoperative
Refer to Wiring Diagrams Cell 90 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).
Possible Sources
-
Fuse
-
Wiring, terminals or connectors
-
Stoplamp switch
Visual Inspection and Diagnostic Pre-checks
-
Verify CJB fuse 18 (10A) is OK.
PINPOINT TEST A: ALL THE STOPLAMPS ARE INOPERATIVE
A1 CHECK THE STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN |
-
Disconnect: Stoplamp Switch C2314.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C2314-1
|
|
Ground
|
Is the voltage greater than 11 volts?
No |
VERIFY CJB
fuse 18 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to
the Wiring Diagram manual to identify the possible causes of the circuit
short.
|
|
A2 BYPASS THE STOPLAMP SWITCH |
-
Connect a fused jumper wire:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C2314-1
|
|
C2314-2
|
Do the stoplamps illuminate?
Yes |
REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to: Stoplamp Switch (417-01 Exterior Lighting, Removal and Installation).
|
No |
REMOVE the jumper wire. REPAIR the stoplamp switch output circuit for an open.
|
|
One Or More Stoplamps Are Inoperative
Refer to Wiring Diagrams Cell 90 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).
Possible Sources
-
Wiring, terminals or connectors
-
Bulb
-
High mounted stoplamp
PINPOINT TEST B: ONE OR MORE STOPLAMPS ARE INOPERATIVE
B1 IDENTIFY THE INOPERATIVE STOPLAMP |
-
Apply the brake pedal and observe the stoplamps.
Are all the stoplamps inoperative?
Yes |
GO to Pinpoint Test A
|
No |
For the high mounted stoplamp, GO to B2
For a rear stoplamp, GO to B4
|
|
B2 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP |
-
Disconnect: High Mounted Stoplamp C904 (4-door vehicles).
-
Disconnect: High Mounted Stoplamp C9040 (5-door vehicles).
-
While applying the brake pedal, measure:
Click to display connectors
4-Door Vehicles
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C904-1
|
|
Ground
|
Click to display connectors
5-Door Vehicles
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C9040-1
|
|
Ground
|
Is the voltage greater than 11 volts?
No |
REPAIR the high mounted stoplamp supply circuit for an open.
|
|
B3 CHECK THE HIGH MOUNTED STOPLAMP GROUND CIRCUIT FOR AN OPEN |
-
While applying the brake pedal, measure:
Click to display connectors
4-Door Vehicles
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C904-1
|
|
C904-2
|
Click to display connectors
5-Door Vehicles
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C9040-1
|
|
C9040-2
|
Is the voltage greater than 11 volts?
Yes |
INSTALL a new high mounted stoplamp. REFER to: High Mounted Stoplamp (417-01 Exterior Lighting, Removal and Installation).
|
|
B4 CHECK FOR VOLTAGE TO THE REAR LAMP ASSEMBLY |
-
Disconnect: Inoperative 4-Door LH Rear Lamp C412 or RH Rear Lamp C415.
-
Disconnect: Inoperative 5-Door LH Rear Lamp C414 or RH Rear Lamp C417.
-
While applying the brake pedal, measure:
Click to display connectors
4-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C412-1
|
|
Ground
|
Click to display connectors
4-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C415-1
|
|
Ground
|
Click to display connectors
5-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C414-1
|
|
Ground
|
Click to display connectors
5-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C417-1
|
|
Ground
|
Is the voltage greater than 11 volts?
No |
For 4-door vehicles, GO to B5
For 5-door vehicles, REPAIR the stoplamp supply circuit for an open.
|
|
B5 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE REAR LAMP ASSEMBLY |
-
Using a diagnostic scan tool, perform the BCM self-test.
-
Clear the Diagnostic Trouble Codes (DTCs) and repeat
the self-test (required to enable the lamp output driver).
-
While applying the brake pedal, measure:
Click to display connectors
4-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C412-1
|
|
Ground
|
Click to display connectors
4-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C415-1
|
|
Ground
|
Is the voltage greater than 11 volts?
Yes |
INSTALL a new bulb. REFER to: Rear Lamp Bulb (417-01 Exterior Lighting, Removal and Installation). CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test (required to enable the lamp output driver).
|
|
B6 CHECK THE STOP/TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND |
-
Measure:
Click to display connectors
4-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C412-1
|
|
Ground
|
Click to display connectors
4-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C415-1
|
|
Ground
|
Is the resistance greater than 10,000 ohms?
No |
REPAIR the circuit. CLEAR the Diagnostic Trouble
Codes (DTCs) and REPEAT the self-test (required to enable the lamp
output driver).
|
|
B7 CHECK THE STOP/TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN |
-
Measure:
Click to display connectors
4-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C412-1
|
|
C2280C-12
|
Click to display connectors
4-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C415-1
|
|
C2280C-13
|
Is the resistance less than 3 ohms?
|
B8 CHECK THE REAR STOPLAMP GROUND CIRCUIT FOR AN OPEN |
-
While applying the brake pedal, measure:
Click to display connectors
4-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C412-1
|
|
C412-4
|
Click to display connectors
4-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C415-1
|
|
C415-4
|
Click to display connectors
5-Door LH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C414-1
|
|
C414-6
|
Click to display connectors
5-Door RH Rear Lamp
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C417-1
|
|
C417-6
|
Is the voltage greater than 11 volts?
Yes |
For 4-door vehicles, INSTALL a new bulb. REFER to: Rear Lamp Bulb (417-01 Exterior Lighting, Removal and Installation).
For 5-door vehicles, VERIFY the bulb is OK. If OK,
REPAIR or INSTALL a new rear lamp jumper harness. If not OK, INSTALL a
new bulb. REFER to: Rear Lamp Bulb (417-01 Exterior Lighting, Removal and Installation).
|
|
B9 CHECK FOR CORRECT BCM (BODY CONTROL MODULE)
OPERATION |
-
Disconnect and inspect all BCM connectors.
-
Repair:
-
corrosion (install new connector or terminals – clean module pins)
-
damaged or bent pins – install new terminals/pins
-
pushed-out pins – install new pins as necessary
-
Reconnect the BCM connectors. Make sure they seat and latch correctly.
-
Operate the system and determine if the concern is still present.
Is the concern still present?
Yes |
CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a
TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB
instructions. If no Technical Service Bulletins (TSBs) address this
concern, INSTALL a new BCM . REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
|
No |
The system is operating correctly at this time. The
concern may have been caused by module connections. ADDRESS the root
cause of any connector or pin issues.
|
|
The Stoplamps Are On Continuously
Refer to Wiring Diagrams Cell 90 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).
DTC Fault Trigger Conditions
DTC
|
Description
|
Fault Trigger Conditions
|
C1A96:24
|
Brake Light Switch: Signal Stuck High
|
An on-demand DTC that sets when the BCM detects voltage on the stoplamp switch input during the BCM self-test.
|
Possible Sources
-
Wiring, terminals or connectors
-
Stoplamp switch
-
PCM
PINPOINT TEST C: THE STOPLAMPS ARE ON CONTINUOUSLY
C1 CHECK THE STOPLAMP SWITCH |
-
Disconnect: Stoplamp Switch C2314.
Do the stoplamps continue to illuminate?
No |
INSTALL a new stoplamp switch. REFER to: Stoplamp Switch (417-01 Exterior Lighting, Removal and Installation).
|
|
C2 CHECK THE PCM (POWERTRAIN CONTROL MODULE)
|
-
Disconnect: PCM
C175B (1.6L TIVCT).
-
Disconnect: PCM
C1915B (1.6L EcoBoost).
Do the stoplamps continue to illuminate?
Yes |
REPAIR the stoplamp switch output circuit for a short to voltage.
|
|
C3 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE)
OPERATION |
-
Disconnect and inspect all PCM connectors.
-
Repair:
-
corrosion (install new connector or terminals – clean module pins)
-
damaged or bent pins – install new terminals/pins
-
pushed-out pins – install new pins as necessary
-
Reconnect the PCM connectors. Make sure they seat and latch correctly.
-
Operate the system and determine if the concern is still present.
Is the concern still present?
Yes |
CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a
TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB
instructions. If no Technical Service Bulletins (TSBs) address this
concern,
Click here to access Guided Routine (PCM).
|
No |
The system is operating correctly at this time. The
concern may have been caused by module connections. ADDRESS the root
cause of any connector or pin issues.
|
|
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation)...
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation)...
Other information:
B1407:11, B1407:12, B1407:13 and B1407:1A
Refer to Wiring Diagrams Cell 46 for schematic and connector information.
Normal Operation and Fault Conditions
The RCM continuously monitors the passenger side airbag circuits for the following faults:
Resistance out of range
Unexpected voltage
Short to ground
Faulted passenger side airbag
..
Overview
The BCM
monitors the tire pressure in the 4 road tires with tire pressure
sensors that communicate the tire pressure via radio signals to the BCM .
The tire pressure sensors are battery operated and mounted to the valve
stems. All of the controlling software for the TPMS is contained in the
BCM . The IPC illuminates the TPMS
warning indicator and the message center displa..
Categories
Removal
NOTE:
Removal steps in this procedure may contain installation details.
WARNING:
Before beginning any service procedure in this
manual, refer to health and safety warnings in section 100-00 General
Information. Failure to follow this instruction may result in serious
personal injury.
Refer to: Health and Safety Precautions (100-00 General Information, Description and Operation).
Remove the wheel and tire.
Refer to: Wheel and Tire (204-04A Wheels and Tires, Removal and Installation).
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