Reversing Lamps. Special Tool(s) Fluke 77 IV Digital Multimeter FLU77 4 or equivalent

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1 PINPOINT TEST V: BOTH REVERSI... PINPOINT TEST V: BOTH REVERSING LAMPS ARE INOPERATIVE (EXTERIOR LIGHTING) Exterior Lighting 2010 F 150 DIAGNOSIS AND TESTING Procedure revision date: 07/28/2009 Reversing Lamps Special Tool(s) Fluke 77 IV Digital Multimeter FLU77 4 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit 300 NUD105 R025DE or equivalent Principles of Operation 4R70E/4R75E Transmission When the transmission is in REVERSE (R), the digital Transmission Range (TR) routes voltage to the reversing lamps relay coil. When the relay is energized, voltage is supplied to the reversing lamps. The reversing lamps relay is located in the Battery Junction Box (BJB). 6R80 Transmission/5.4L Engine Combination The Transmission Control Module (TCM) (internal to the transmission) provides voltage and ground to the reversing lamps relay coil. When the transmission is in REVERSE (R), the TCMenergizes the reversing lamps relay which supplies voltage to the reversing lamps. 6R80 Transmission/6.2L Engine Combination The PCM provides ground to the reversing lamps relay coil. When the transmission is in REVERSE (R), the PCM energizes the reversing lamps relay which supplies voltage to the reversing lamps. Pinpoint Tests Pinpoint Test V: Both Reversing Lamps Are Inoperative Refer to Wiring Diagrams Cell 93, Reversing Lamps for schematic and connector information. rmal Operation 4R70E/4R75E Transmission When the ignition switch is in the RUN position, voltage is supplied from the Battery Junction Box (BJB) fuse 54 (5A) to the digital Transmission Range (TR) sensor. When the transmission is in REVERSE (R), the digital TRsensor routes voltage to the reversing lamps relay coil. Battery voltage is supplied from the BJBfuse 43 (20A) to the reversing lamps relay switch side. When the reversing lamps relay is energized, voltage is routed to the reversing lamps. The reversing lamps share a common ground circuit. 6R80 Transmission/5.4L Engine Combination The reversing lamps relay coil power and ground are supplied and controlled by the Transmission Control Module (TCM) (also called the mechatronic assembly). When the transmission is in REVERSE (R), the TCMenergizes the reversing lamps relay. Battery voltage is supplied from the BJBfuse 43 (20A) to the reversing lamps relay switch side. When the reversing lamps relay is energized, voltage is routed to the reversing lamps. The reversing lamps share a common ground circuit. 6R80 Transmission/6.2L Engine Combination The reversing lamps relay coil is supplied voltage when the PCM relay is energized (ignition system is in the RUN state). When the transmission is in REVERSE (R), the PCM provides ground to energize the reversing lamps relay. When the reversing lamps relay is energized, voltage is routed to the reversing lamps. The reversing lamps share a common ground circuit. This pinpoint test is intended to diagnose the following: Fuse Wiring, terminals or connectors Digital TRsensor adjustment (4R70E/4R75E transmission) 1/7

2 Reversing lamps relay Digital TRsensor (4R70E/4R75E transmission) TCM(6R80 transmission/5.4l engine combination) PCM (6R80 transmission/6.2l engine combination) PINPOINT TEST V : BOTH REVERSING LAMPS ARE INOPERATIVE NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. V1 CHECK FOR VOLTAGE TO THE LH REVERSING LAMP Disconnect: LH Reversing Lamp C487 (Styleside) or C451 (Flareside). Apply the parking brake. Select REVERSE. For Styleside vehicles, measure the voltage between the LH reversing lamp C487 1, circuit CAT16 (GY/BN), harness side and ground. For Flareside vehicles, measure the voltage between the LH reversing lamp C451 3, circuit CAT16 (GY/BN), harness side and ground. REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation. GO to V2. V2 CHECK THE REVERSING LAMPS RELAY Select PARK. Connect: LH Reversing Lamp C487 (Styleside) or C451 (Flareside). Disconnect: Reversing Lamps Relay. Substitute a known good relay. Select REVERSE. Do the reversing lamps illuminate? REMOVE the known good relay. INSTALL a new reversing lamps relay. TEST the system for normal operation. REMOVE the known good relay. GO to V3. V3 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY (SWITCH SIDE) Select PARK. Measure the voltage between the reversing lamps relay pin 3, circuit SBB43 (BU/RD), BJBface side and ground. 2/7

3 GO to V4. VERIFY the BJBfuse 43 (20A) is OK. If OK, REPAIR circuit SBB43 (BU/RD) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short. V4 BYPASS THE REVERSING LAMPS RELAY Connect a fused jumper wire between the reversing lamps relay pin 3, circuit SBB43 (BU/RD), BJBface side and the reversing lamps relay pin 5, circuit CAT16 (GY/BN), BJBface side. Do the reversing lamps illuminate? REMOVE the jumper wire. For vehicles with a 4R70E/4R75E transmission, GO to V5. For vehicles with a 6R80 transmission/5.4l engine combination, GO to V9. For vehicles with a 6R80 transmission/6.2l engine combination, GO to V12. REMOVE the jumper wire. REPAIR circuit CAT16 (GY/BN) for an open. TEST the system for normal operation. V5 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY COIL (4R70E/4R75E TRANSMISSION) Select REVERSE. Measure the voltage between the reversing lamp relay pin 1, circuit CET47 (BU), BJBface side and ground. REPAIR circuit GD123 (BK/GY) for an open. TEST the system for normal operation. GO to V6. V6 CHECK FOR VOLTAGE TO THE DIGITAL TRSENSOR 3/7

4 Select PARK. Connect: Reversing Lamps Relay. Disconnect: Digital TRSensor C167. Measure the voltage between the digital TRsensor C167 9, circuit CBB54 (VT/OG), harness side and ground. GO to V7. VERIFY the BJBfuse 54 (5A) is OK. If OK, REPAIR circuit CBB54 (VT/OG) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short. V7 BYPASS THE DIGITAL TRSENSOR Connect a fused jumper wire between the digital TRsensor C167 9, circuit CBB54 (VT/OG), harness side and the digital TRsensor C167 11, circuit CET47 (BU), harness side. Do the reversing lamps illuminate? REMOVE the jumper wire. GO to V8. REMOVE the jumper wire. REPAIR circuit CET47 (BU) for an open. TEST the system for normal operation. V8 CHECK THE DIGITAL TRSENSOR ADJUSTMENT Check the digital TRsensor alignment. Refer to Section A. Is the digital TRsensor aligned correctly? INSTALL a new digital TRsensor. REFER to Section A. TEST the system for normal operation. ADJUST the digital TRsensor. REFER to Section A. TEST the system for normal operation. V9 CHECK THE REVERSING LAMPS RELAY COIL CIRCUITS FOR A SHORT TO VOLTAGE Disconnect: TCMC1575. Measure the voltage between the reversing lamps relay pin 1, circuit CET41 (BN/YE), BJBface side and ground; and between the reversing lamps relay pin 2, circuit CLS28 (BU/WH), BJBface side and ground. 4/7

5 Is any voltage present? REPAIR the circuit in question for a short to voltage. CLEAR the DTCs. REPEAT the self test. GO to V10. V10 CHECK THE REVERSING LAMPS RELAY COIL CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the reversing lamps relay pin 1, circuit CET41 (BN/YE), BJBface side and ground; and between the reversing lamps relay pin 2, circuit CLS28 (BU/WH), BJBface side and ground. Are the resistances greater than 10,000 ohms? GO to V11. REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self test. V11 CHECK THE REVERSING LAMPS RELAY COIL CIRCUITS FOR AN OPEN Measure the resistance between the reversing lamps relay pin 1, circuit CET41 (BN/YE), BJBface side and the TCMC1575 7, circuit CET47 (BU), harness side. Measure the resistance between the reversing lamps relay pin 2, circuit CLS28 (BU/WH), BJBface side and the TCMC , circuit CLS28 (BU/WH), harness side. Are the resistances less than 5 ohms? 5/7

6 GO to V15. REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self test. V12 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY COIL (6R80 TRANSMISSION) Measure the voltage between the reversing lamp relay pin 1, circuit CBB77 (WH), BJBface side and ground. GO to V13. REPAIR circuit CBB77 (WH) for an open. TEST the system for normal operation. V13 CHECK THE REVERSING LAMPS RELAY COIL GROUND CONTROLLED CIRCUIT FOR A SHORT TO VOLTAGE Disconnect: PCM C1381B. Measure the voltage between the reversing lamp relay pin 2, circuit CLS28 (BU/WH), BJBface side and ground. Is any voltage present? GO to V14. REPAIR circuit CLS28 (BU/WH) for a short to voltage. TEST the system for normal operation. V14 CHECK FOR VOLTAGE TO THE PCM Connect: Reversing Lamps Relay. Measure the voltage between the PCM C1381B 63, circuit CLS28 (BU/WH), harness side and ground. 6/7

7 GO to V16. REPAIR circuit CLS28 (BU/WH) for an open. TEST the system for normal operation. V15 CHECK FOR CORRECT TCMOPERATION Disconnect the TCMconnector. Check for: corrosion damaged pins pushed out pins Connect the TCMconnector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? INSTALL a new TCM. REFER to Section B, Mechatronic Assembly. TEST the system for normal operation. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR any DTCs. REPEAT the self test. V16 CHECK FOR CORRECT PCM OPERATION Disconnect the PCM connectors. Check for: corrosion damaged pins pushed out pins Connect the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? INSTALL a new PCM. REFER to Section TEST the system for normal operation. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR any DTCs. REPEAT the self test. This publication contains material that is reproduced and distributed under a license from Ford Motor Company. further reproduction or distribution of the Ford Motor Company material is allowed without the express written permission of Ford Motor Company. Copyright Service Repair Solutions, Inc. 7/7

DIAGNOSIS AND TESTING

413-06-1 Horn 413-06-1 DIAGNOSIS AND TESTING Horn Special Tool(s) Fluke 77-IV Digital Multimeter FLU77-4 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software