Ford Fiesta Manuals

Ford Fiesta: Exterior Lighting / Reversing Lamps. Diagnosis and Testing

Ford Fiesta 2014 - 2019 Service Manual / Lighting / Exterior Lighting / Reversing Lamps. 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
C1137:24 Reverse Gear 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: Reversing Lamps

  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 reversing lamps are inoperative Refer to the Pinpoint Test   GO to Pinpoint Test A
An individual reversing lamp is inoperative Refer to the Pinpoint Test   GO to Pinpoint Test B
The reversing lamps are on continuously Refer to the Pinpoint Test   GO to Pinpoint Test C

Pinpoint Tests

All the Reversing Lamps Are Inoperative


Refer to Wiring Diagrams Cell 93 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
  • Reversing lamp switch (manual transmission)
  • Reversing lamps relay (automatic transmission)
  • TCM (automatic transmission)

Visual Inspection and Diagnostic Pre-checks

  • Inspect CJB fuse 6 (10A).

PINPOINT TEST A: ALL THE REVERSING LAMPS ARE INOPERATIVE
A1 DETERMINE THE TRANSMISSION TYPE
  • Check the vehicle for a manual transmission.

Is the vehicle equipped with a manual transmission?
Yes VERIFY the CJB fuse 6 (10A) is OK. If OK, GO to A2 If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.
No VERIFY the CJB fuse 6 (10A) is OK. If OK, GO to A4If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

A2 CHECK FOR VOLTAGE TO THE REVERSING LAMP SWITCH
  • Ignition OFF.
  • Disconnect: Reversing Lamp Switch C1131.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1131-1   Ground

Is the voltage greater than 11 volts?
Yes GO to A3
No REPAIR the circuit.

A3 BYPASS THE REVERSING LAMP SWITCH
  • Connect a fused jumper wire:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1131-1   C1131-2

Do the reversing lamps illuminate?
Yes REMOVE the fused jumper wire. INSTALL a new reversing lamp switch.
REFER to: Reversing Lamp Switch (417-01 Exterior Lighting, Removal and Installation).
No For 4-door vehicles, REMOVE the fused jumper wire. GO to A9
For 5-door vehicles, REMOVE the fused jumper wire. REPAIR the reversing lamps voltage supply circuit.

A4 CHECK THE REVERSING LAMPS RELAY
  • Disconnect: reversing lamps relay.
  • Ignition ON.
  • Substitute a known good relay and recheck the reversing lamps operation.

Do the reversing lamps operate correctly?
Yes REMOVE the known good relay. INSTALL a new reversing lamps relay.
No REMOVE the known good relay. GO to A5

A5 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Reversing Lamps Relay Pin 1   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Reversing Lamps Relay Pin 3   Ground

Are the voltages greater than 10 volts?
Yes GO to A6
No REPAIR the circuit in question.

A6 BYPASS THE REVERSING LAMPS RELAY
  • Connect a fused jumper wire:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Reversing Lamps Relay Pin 3 Reversing Lamps Relay Pin 5

Do the reversing lamps illuminate?
Yes REMOVE the fused jumper wire. GO to A7
No For 4-door vehicles, REMOVE the fused jumper wire. GO to A9
For 5-door vehicles, REMOVE the fused jumper wire. REPAIR the reversing lamps voltage supply circuit.

A7 CHECK THE REVERSING LAMPS RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect: TCM C1750A.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Reversing Lamps Relay Pin 2   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to A8

A8 CHECK THE REVERSING LAMPS RELAY CONTROL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Reversing Lamps Relay Pin 2   C1750A-40

Is the resistance less than 3 ohms?
Yes GO to A10
No REPAIR the circuit.

A9 CHECK THE REVERSING LAMPS GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: LH Reversing Lamp C498.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C498-1   C498-4

Is the resistance less than 3 ohms?
Yes REPAIR the reversing lamps voltage supply circuit.
No REPAIR the circuit.

A10 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.


An Individual Reversing Lamp Is Inoperative


Refer to Wiring Diagrams Cell 93 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

  • Bulb
  • Wiring, terminals or connectors

PINPOINT TEST B: AN INDIVIDUAL REVERSING LAMP IS INOPERATIVE
B1 CHECK FOR VOLTAGE TO THE REVERSING LAMP
  • Ignition OFF.
  • Apply the parking brake.
  • Disconnect: Inoperative 4-Door LH Reversing Lamp C498 or RH Reversing Lamp C499.
  • Disconnect: Inoperative 5-Door LH Rear Lamp C414 or RH Rear Lamp C417.
  • Ignition ON.
  • Place the gear selector lever in the reverse.
  • Measure:
    Click to display connectors

      4-Door LH Reversing Lamp


    Positive Lead Measurement / Action Negative Lead
      C498-1   Ground

    Click to display connectors

      4-Door RH Reversing Lamp


    Positive Lead Measurement / Action Negative Lead
      C499-1   Ground

    Click to display connectors

      5-Door LH Rear Lamp


    Positive Lead Measurement / Action Negative Lead
      C414-3   Ground

    Click to display connectors

      5-Door RH Rear Lamp


    Positive Lead Measurement / Action Negative Lead
      C417-3   Ground

Is the voltage greater than 11 volts?
Yes GO to B2
No REPAIR the reversing lamp voltage supply circuit.

B2 CHECK THE REVERSING LAMP GROUND CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors

      4-Door LH Reversing Lamp


    Positive Lead Measurement / Action Negative Lead
      C498-1   C498-4

    Click to display connectors

      4-Door RH Reversing Lamp


    Positive Lead Measurement / Action Negative Lead
      C499-1   C499-4

    Click to display connectors

      5-Door LH Rear Lamp


    Positive Lead Measurement / Action Negative Lead
      C414-3   C414-6

    Click to display connectors

      5-Door RH Rear Lamp


    Positive Lead Measurement / Action Negative Lead
      C417-3   C417-6

Is the voltage greater than 11 volts?
Yes For 4-door vehicles, INSTALL a new bulb.
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.
No REPAIR the circuit.


The Reversing Lamps Are On Continuously


Refer to Wiring Diagrams Cell 93 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
C1137:24 Reverse Gear Switch: Signal Stuck High

A continuous and on-demand DTC that sets when the BCM detects one of the following:

  • Reversing lamp switch input detects voltage (transmission selector in REVERSE) for greater than 1 second while the vehicle speed is greater than 60 km/h (37 mph).
  • Reversing lamp switch input detects a short to ground during the BCM self-test.

Possible Sources

  • Wiring, terminals or connectors
  • Gear range input
  • GPSM
  • TCM
  • Auto-dimming interior rear view mirror
  • BCM

PINPOINT TEST C: THE REVERSING LAMPS ARE ON CONTINUOUSLY
C1 DETERMINE THE TRANSMISSION TYPE
  • Check the vehicle for a manual transmission.

Is the vehicle equipped with a manual transmission?
Yes GO to C2
No GO to C3

C2 CHECK THE REVERSING LAMP SWITCH
  • Ignition OFF.
  • Disconnect: Reversing Lamp Switch C1131.
  • Ignition ON.

Do the reversing lamps continue to illuminate?
Yes If equipped with SYNC®, GO to C4
If not equipped with SYNC®, GO to C5
No INSTALL a new reversing lamp switch.
REFER to: Reversing Lamp Switch (417-01 Exterior Lighting, Removal and Installation).

C3 CHECK THE REVERSING LAMPS RELAY OUTPUT
  • Ignition OFF.
  • Disconnect: reversing lamps relay.
  • Ignition ON.

Do the reversing lamps continue to illuminate?
Yes If equipped with SYNC®, GO to C4
If not equipped with SYNC®, GO to C5
No GO to C7

C4 CHECK THE GPSM (GLOBAL POSITIONING SYSTEM MODULE) FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect: GPSM C9050.
  • Ignition ON.

Do the reversing lamps continue to illuminate?
Yes GO to C5
No GO to C10

C5 CHECK THE BCM (BODY CONTROL MODULE) FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect: BCM C2280D.
  • Ignition ON.

Do the reversing lamps continue to illuminate?
Yes If equipped with an auto-dimming interior rear view mirror, GO to C6
If not equipped with an auto-dimming interior rear view mirror, REPAIR the reversing lamps voltage supply circuit for a short to voltage.
No GO to C11

C6 CHECK THE AUTO-DIMMING INTERIOR REAR VIEW MIRROR FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect: Auto-Dimming Interior Rear View Mirror C911 (without rain sensor).
  • Disconnect: Auto-Dimming Interior Rear View Mirror C9012 (with rain sensor).
  • Ignition ON.

Do the reversing lamps continue to illuminate?
Yes REPAIR the circuit.
No INSTALL a new auto-dimming interior rear view mirror.
REFER to: Interior Rear View Mirror (501-09 Rear View Mirrors, Removal and Installation).

C7 CHECK THE REVERSING LAMPS RELAY
  • Ignition OFF.
  • Disconnect: reversing lamps relay.
  • Ignition ON.
  • Substitute a known good relay.

Do the reversing lamps continue to illuminate?
Yes REMOVE the known good relay. GO to C8
No REMOVE the known good relay. INSTALL a new reversing lamps relay.

C8 CHECK THE REVERSING LAMPS RELAY ENABLE CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Connect: reversing lamps relay.
  • Disconnect: TCM C1750A.
  • Ignition ON.

Do the reversing lamps continue to illuminate?
Yes REPAIR the circuit.
No GO to C9

C9 CHECK THE TCM (TRANSMISSION CONTROL MODULE) GEAR STATUS INPUT PID (PARAMETER IDENTIFICATION)
  • Ignition OFF.
  • Connect: TCM C1750A.
  • Ignition ON.
  • Using a diagnostic scan tool, view TCM Parameter Identifications (PIDs).
  • Monitor the TCM GEAR_ENGAGED PID while placing the gear selector lever through all its positions.

Does the PID agree with the gear selections?
Yes GO to C12
No
REFER to: Automatic Transmission (307-01 Automatic Transmission - 6-Speed PowerShift Transmission – DPS6/6DCT250, Diagnosis and Testing).
to diagnose the gear input.

C10 CHECK FOR CORRECT GPSM (GLOBAL POSITIONING SYSTEM MODULE) OPERATION
  • Disconnect and inspect the GPSM connector.
  • 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 GPSM connector. Make sure it seats and latches 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 GPSM . For vehicles not equipped with a touchscreen,
REFER to: Global Positioning System Module (GPSM) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation).
For vehicles equipped with a touchscreen,
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.

C11 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.

C12 CHECK FOR CORRECT TCM (TRANSMISSION CONTROL MODULE) OPERATION
  • Disconnect and inspect all TCM 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 TCM 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 TCM .
REFER to: Transmission Control Module (TCM) (307-01 Automatic Transmission - 6-Speed PowerShift Transmission – DPS6/6DCT250, 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.


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