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Contents Wiring diagrams Section: Exterior Lighting System All sections

Possible Causes Mercury Montego III

Exterior Lighting System 17 illustrations ~3510 words

Possible Causes

  1. Fuse
  2. Circuit 1231 (RD/WH)
  3. SJB

Scheme 59

Scheme 59: Testing
Scheme 59: Testing
  1. A1 CHECK CIRCUIT 1231 (RD/WH) FOR AN OPEN Key in OFF position. Disconnect: SJB C2280a. Measure the voltage between the SJB C2280a-29, circuit 1231 (RD/WH), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to A2. No : VERIFY the BJB fuse 19 (40A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  2. A2 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  1. Fuse
  2. Circuit 1205 (BK) open
  3. Circuit 1337 (VT/YE) open
  4. Circuit 1708 (LG/BK) open
  5. Multifunction switch
  6. SJB

Scheme 60

Scheme 60: Testing
Scheme 60: Testing

Scheme 61

Scheme 61
Scheme 61

Scheme 62

Scheme 62
Scheme 62

Scheme 63

Scheme 63
Scheme 63
  1. B1 CHECK THE MULTIFUNCTION SWITCH INPUT Key in ON position. Enter the following diagnostic mode on the diagnostic tool: SJB Multifunction Switch PID. Monitor the SJB multifunction switch high beam status PID while placing the multifunction switch in the HIGH BEAM position. Does the PID agree with the multifunction switch position? Yes : VERIFY the SJB fuse 1 (20A) is OK. If OK, GO to B5 . No : GO to B2.
  2. B2 CHECK THE MULTIFUNCTION SWITCH Key in OFF position. Disconnect: Multifunction Switch C202a. Connect a fused (5A) jumper wire between the multifunction switch C202a-8, circuit 1708 (LG/BK), harness side and the multifunction switch C202a-10, circuit 1205 (BK), harness side. Key in ON position. Do the high beam illuminate? Yes : INSTALL a new multifunction switch. REFER to «STEERING COLUMN SWITCHES»(ref-233041) . TEST the system for normal operation. No : REMOVE the jumper wire. GO to B3.
  3. B3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Key in OFF position. Measure the resistance between the multifunction switch C202a-10, circuit 1205 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to B4. No : REPAIR the circuit. TEST the system for normal operation.
  4. B4 CHECK CIRCUIT 1708 (LG/BK) FOR AN OPEN Disconnect: SJB !280d. Measure the resistance between the multifunction switch C202a-8, circuit 1708 (LG/BK), harness side and the SJB C2280d-28, circuit 1708 (LG/BK), harness side. Is the resistance less than 5 ohms? Yes : GO to B6 . No : REPAIR the circuit. TEST the system for normal operation.
  5. B5 CHECK CIRCUIT 1337 (VT/YE) FOR AN OPEN Key in OFF position. Disconnect: SJB C2280a. Connect a fused (20A) jumper wire between the SJB C2280a-29, circuit 1231 (RD/WH), harness side and the SJB C2280a-23, circuit 1337 (VT/YE), harness side. Do the high beams illuminate? Yes : GO to B6. No : REPAIR the circuit. TEST the system for normal operation
  6. B6 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  1. Fuse
  2. Circuit 1205 (BK) open
  3. Circuit 1336 (LG/WH) open or short to ground
  4. Circuit 1338 (WH) open or short to ground
  5. Circuit 1724 (WH/LG) open
  6. Circuit 1779 (DB/LG) open
  7. Ballast
  8. HID bulb
  9. Headlamp assembly
  10. SJB

Scheme 64

Scheme 64: Testing
Scheme 64: Testing

Scheme 65

Scheme 65
Scheme 65
  1. C1 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Key in OFF position. Disconnect: Inoperative Headlamp. Measure the resistance between the inoperative headlamp, harness side and ground as follows: CONNECTOR-PIN REFERENCE Vehicle Inoperative Headlamp Connector-Pin Circuit Freestyle LH C1021-2 1205 (BK) Freestyle RH C1041-2 1205 (BK) Five Hundred LH C1020-1 1205 (BK) Five Hundred RH C1112-1 1205 (BK) Montego LH C1284-4 1205 (BK) Montego RH C1285-4 1205 (BK) Is the resistance less than 5 ohms? Yes : For Montego, GO to C2. For Freestyle or Five Hundred, GO to C3 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  2. C2 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR VOLTAGE Place the headlamp switch in the HEADLAMPS ON position. Measure the voltage between the LH headlamp C1284-1, circuit 1338 (WH), harness side and ground; or between the RH headlamp C1285-1, circuit 1336 (LG/WH), harness side and ground. Is the voltage greater than 10 volts? Yes : TURN the headlamps off. GO to C4 . No : TURN the headlamps off. GO to C3.
  3. C3 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR AN OPEN Disconnect: SJB C2280a. Measure the resistance between the inoperative headlamp, harness side and the SJB, harness side as follows: SJB CONNECTOR-PIN REFERENCE Vehicle Inoperative Headlamp Connector-Pin SJB Connector-Pin Circuit Freestyle LH C1021-1 C2280a-9 1338 (WH) Freestyle RH C1041-1 C2280a-l 1336 (LG/WH) Five Hundred LH C1020-2 C2280a-9 1338 (WH) Five Hundred RH C1112-2 C2280a-l 1336 (LG/WH) Montego LH C1284-1 C2280a-9 1338 (WH) Montego RH C1285-1 C2280a-l 1336 (LG/WH) Is the resistance less than 5 ohms? Yes : GO to C7 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  4. C4 CHECK CIRCUIT 1779 (DB/LG) OR CIRCUIT 1724 (WH/LG) FOR AN OPEN Measure the voltage between the LH headlamp C1284-6, circuit 1724 (WH/LG), harness side and ground; or between the RH headlamp C1285-6, circuit 1779 (DB/LG), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to C5. No : VERIFY the BJB fuse 31 (20A) (LH headlamp) or fuse 20 (20A) (RH headlamp) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. C5 CHECK THE BALLAST Substitute a known good ballast. Place the headlamp switch in the HEADLAMPS ON position Does the inoperative low beam now illuminate? Yes : INSTALL a new ballast. REFER to «BALLAST»(ref-233037-S42764555732006052400000) . CLEAR the DTCs. REPEAT the self-test. No : TURN the headlamps off. INSTALL the original ballast. GO to C6.
  6. C6 CHECK THE HID BULB Substitute a known good HID bulb. Place the headlamp switch in the HEADLAMPS ON position. Does the inoperative low beam now illuminate? Yes : INSTALL a new HID bulb. REFER to «HEADLAMP BULB»(ref-233037-S35934386662006052400000) . CLEAR the DTCs. REPEAT the self-test. No : INSTALL a new headlamp assembly. REFER to «HEADLAMP ASSEMBLY - FIVE HUNDRED, MONTEGO»(ref-233037-S24559653782006052400000) . CLEAR the DTCs. REPEAT the self-test.
  7. C7 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  1. Circuit 1205 (BK) open
  2. Circuit 1337 (VT/YE) open
  3. Headlamp assembly

Scheme 66

Scheme 66: Testing
Scheme 66: Testing
  1. D1 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Key in OFF position. Disconnect: Inoperative Headlamp. Measure the resistance between the inoperative headlamp, harness side and ground as follows: CONNECTOR-PIN REFERENCE Vehicle Inoperative Headlamp Connector-Pin Circuit Freestyle LH C1021-2 1205 (BK) Freestyle RH C1041-2 1205 (BK) Five Hundred LH C1111-1 1205 (BK) Five Hundred RH C1040-1 1205 (BK) Montego LH C1284-4 1205 (BK) Montego RH C1285-4 1205 (BK) Is the resistance less than 5 ohms? Yes : For Montego, GO to D2. For Freestyle or Five Hundred, REPAIR circuit 1337 (VT/YE). TEST the system for normal operation. No : REPAIR circuit 1205 (BK). TEST the system for normal operation.
  2. D2 CHECK CIRCUIT 1337 (VT/YE) FOR AN OPEN Place the headlamp switch in the HEADLAMPS ON position. Place the multifunction switch in the HIGH BEAM position. Measure the voltage between the LH headlamp C1284-7, circuit 1337 (VT/YE), harness side and ground; or between the RH headlamp C1285-7, circuit 1337 (VT/YE), harness side and ground. Is the voltage greater than 10 volts? Yes : INSTALL a new headlamp assembly. REFER to «HEADLAMP ASSEMBLY - FIVE HUNDRED, MONTEGO»(ref-233037-S24559653782006052400000) . TEST the system for normal operation. No : REPAIR the circuit. TEST the system for normal operation.
  1. Circuit 196 (DB/OG) short to ground
  2. Circuit 1205 (BK) open
  3. Circuit 1336 (LG/WH) short to voltage
  4. Circuit 1337 (VT/YE) short to voltage
  5. Circuit 1338 (WH) short to voltage
  6. Circuit 1399 (DB/WH) open or short to ground
  7. Circuit 1400 (TN/WH) open or short to ground
  8. Circuit 1401 (BK/LG) open
  9. Circuit 1402 (RD/WH) open or short to ground
  10. Circuit 1708 (LG/BK) short to ground
  11. Headlamp switch
  12. Multifunction switch
  13. SJB

Scheme 67

Scheme 67: Testing
Scheme 67: Testing

Scheme 68

Scheme 68
Scheme 68

Scheme 69

Scheme 69
Scheme 69
  1. E1 CHECK THE HEADLAMP SWITCH INPUT Key in ON position. Enter the following diagnostic mode on the diagnostic tool: SJB Headlamp Switch PIDs. Monitor the SJB headlamp switch PIDs while moving the headlamp switch through all positions. Do the PIDs agree with the headlamp switch positions? Yes : If the low beams are always on, GO to E6 . If the high beams are always on, GO to E7 . No : GO to E2.
  2. E2 CHECK THE HEADLAMP SWITCH Key in OFF position. Disconnect: Headlamp Switch C205. Carry out the headlamp switch component test. Refer to «COMPONENT TESTING»(ref-233795) . Is the headlamp switch OK? Yes : GO to E3. No : INSTALL a new headlamp switch. CLEAR the DTCs. REPEAT the self-test.
  3. E3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Measure the resistance between the headlamp switch C205-7, circuit 1205 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to E4. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. E4 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND Disconnect: SJB 2280d. Measure the resistance between the headlamp switch, harness side and ground as follows: SJB CONNECTOR-PIN REFERENCE Connector-Pin Circuit C205-4 (if equipped with autolamps) 1399 (DB/WH) C205-9 1400 (TN/WH) C205-5 1401 (BK/LG) C205-10 1402 (RD/WH) Are the resistances greater than 10,000 ohms? Yes : GO to E5. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. E5 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN Measure the resistance between the headlamp switch, harness side and the SJB, harness side as follows: SJB CONNECTOR-PIN REFERENCE Headlamp Switch Connector-Pin SJB Connector-Pin Circuit C205-4 (if equipped with autolamps) C2280d-24 1399 (DB/WH) C205-9 C2280d-7 1400 (TN/WH) C205-5 C2280d-26 1401 (BK/LG) C205-10 C2280d-8 1402 (RD/WH) Are the resistances less than 5 ohms? Yes : GO to E11 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  6. E6 CHECK CIRCUIT 1336 (LG/WH) AND CIRCUIT 1338 (WH) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: SJB 2280a. Key in ON position. Does either headlamp continue to illuminate? Yes : REPAIR circuit 1338 (WH) (LH headlamp) or circuit 1336 (LG/WH) (RH headlamp) as necessary. CLEAR the DTCs. REPEAT the self-test. No : GO to E11 .
  7. E7 CHECK THE INPUT FROM THE MULTIFUNCTION SWITCH Enter the following diagnostic mode on the diagnostic tool: SJB Multifunction Switch PIDs. Monitor the SJB multifunction switch PIDs while placing the multifunction switch in the HIGH BEAM, LOW BEAM and FLASH-TO-PASS positions. Do the PIDs agree with the multifunction switch positions? Yes : GO to E10 . No : GO to E8.
  8. E8 CHECK CIRCUITS 196 (DB/OG) AND 1708 (LG/BK) FOR A SHORT TO GROUND Key in OFF position. Disconnect: SJB C2280d. Disconnect: Multifunction Switch C202a. Measure the resistance between the multifunction switch C202a-9, circuit 196 (DB/OG), harness side and ground; and between the multifunction switch C202a-8, circuit 1708 (LG/BK), harness side and ground. Are the resistances greater than 10,000 ohms? Yes : GO to E9. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  9. E9 CHECK THE MULTIFUNCTION SWITCH Connect: Multifunction Switch C202a. NOTE: Make sure the multifunction switch is in the LOW BEAM position. Measure the resistance between the SJB C2280d-13, circuit 196 (DB/OG), harness side and ground; and between the SJB C2280d-28, circuit 1708 (LG/BK), harness side and ground. Are the resistances greater than 10,000 ohms? Yes : GO to E11 . No : INSTALL a new multifunction switch. REFER to «STEERING COLUMN SWITCHES»(ref-233041) . CLEAR the DTCs. REPEAT the self-test.
  10. E10 CHECK CIRCUIT 1337 (VT/YE) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: SJB 02280a. Key in ON position. Do the headlamps continue to illuminate? Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. No : GO to E11.
  11. E11 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  1. Circuit 196 (DB/OG) open
  2. Multifunction switch
  3. SJB

Scheme 70

Scheme 70: Testing
Scheme 70: Testing

Scheme 71

Scheme 71
Scheme 71
  1. F1 CHECK HIGH BEAM OPERATION Place the headlamp switch in the HEADLAMPS ON position. Place the multifunction switch in the HIGH BEAM position. Do the high beams operate correctly? Yes : GO to F2. No : GO to «PINPOINT TEST B»(ref-233037-S39982771462006052400000) .
  2. F2 CHECK CIRCUIT 196 (DB/OG) FOR AN OPEN Key in OFF position. Disconnect: SJB Disconnect: Multifunction Switch C202a. Measure the resistance between the multifunction switch C202a-9, circuit 196 (DB/OG), harness side and the SJB C2280d-13, circuit 196 (DB/OG), harness side. Is the resistance less than 5 ohms? Yes : GO to F3. No : REPAIR the circuit. TEST the system for normal operation.
  3. F3 CHECK THE MULTIFUNCTION SWITCH Connect: Multifunction Switch C202a. While placing the multifunction switch in the FLASH-TO-PASS position, measure the resistance between the SJB C2280d-13, circuit 196 (DB/OG), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to F4. No : INSTALL a new multifunction switch. REFER to «STEERING COLUMN SWITCHES»(ref-233041) . TEST the system for normal operation.
  4. F4 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Refer to HEADLIGHTS (Montego), HEADLIGHTS (Five Hundred), or HEADLIGHTS (Freestyle) for schematic and connector information.

  1. Circuit 1416 (YE/WH) short to ground
  2. Light sensor
  3. SJB

Scheme 72

Scheme 72: Testing
Scheme 72: Testing

Scheme 73

Scheme 73
Scheme 73
  1. G1 CHECK SMART JUNCTION BOX (SJB) DTCs Key in OFF position. Using the recorded results from the SJB self-test: Was DTC B1793 recorded? Yes : GO to G3 . No : GO to G2.
  2. G2 CHECK THE MANUAL HEADLAMP AND PARKING LAMP OPERATION Place the headlamp switch in the HEADLAMPS ON position. Do the headlamps and parking lamps operate correctly? Yes : GO to G3. No : REFER to «HEADLAMPS»(ref-233037-S04295076842006052400000) or «PARKING, REAR AND LICENSE LAMPS»(ref-233037-S16730308092006052400000) to continue diagnosis of the headlamps or parking lamps.
  3. G3 CHECK FOR VOLTAGE TO THE LIGHT SENSOR Disconnect: Light Sensor C286. Key in ON position. Place the headlamp switch in the AUTOLAMPS ON position. Measure the voltage between the light sensor C286-2, circuit 1416 (YE/WH), harness side and ground. Is the voltage approximately 5 volts? Yes : INSTALL a new light sensor. CLEAR the DTCs. REPEAT the self-test. No : GO to G4.
  4. G4 CHECK CIRCUIT 1416 (YE/WH) FOR A SHORT TO GROUND Key in OFF position. Disconnect: SJB C2280d. Measure the resistance between the light sensor C286-2, circuit 1416 (YE/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to G5. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. G5 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  1. Circuit 1205 (DB/WH) open
  2. Circuit 1399 (DB/WH) open or short to ground
  3. Circuit 1400 (TN/WH) open or short to ground
  4. Circuit 1402 (RD/WH) short to ground
  5. Circuit 1416 (YE/WH) open or short to voltage
  6. Light sensor
  7. Headlamp switch
  8. SJB

Scheme 74

Scheme 74
Scheme 74

Scheme 75

Scheme 75
Scheme 75
  1. H1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST Using the recorded results from the SJB self-test: Were any DTCs recorded? Yes : For DTC B2498, GO to H2. For DTC B1472 or B1692, GO to H4 . For DTC B1792, GO to H7 . No : GO to H2.
  2. H2 CHECK THE SJB HEADLAMP SWITCH PIDs Key in ON position. Enter the following diagnostic mode on the diagnostic tool: SJB Headlamp Switch PIDs. Monitor the SJB headlamp switch PIDs while moving the headlamp switch through all positions. Do the headlamp switch positions agree with the PIDs? Yes : GO to H7 . No : GO to H3.
  3. H3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (HEADLAMP SWITCH) Key in OFF position. Disconnect: Headlamp Switch C205. Measure the resistance between the headlamp switch C205-7, circuit 1205 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to H4. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. H4 CHECK THE HEADLAMP SWITCH Key in OFF position. Disconnect: Headlamp Switch C205. Carry out the headlamp switch component test. Refer to «COMPONENT TESTING»(ref-233795) . Is the headlamp switch OK? Yes : GO to H5. No : INSTALL a new headlamp switch. CLEAR the DTCs. REPEAT the self-test.
  5. H5 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND Disconnect: SJB C2280d. Measure the resistance between the headlamp switch, harness side and ground as follows: CONNECTOR-PIN REFERENCE Connector-Pin Circuit C205-4 1399 (DB/WH) C205-9 1400 (TN/WH) C205-5 1401 (BK/LG) C205-10 1402 (RD/WH) Are the resistances greater than 10,000 ohms? Yes : GO to H6. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  6. H6 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN Measure the resistance between the headlamp switch, harness side and the SJB, harness side as follows: HEADLAMP SWITCH CONNECTOR-PIN REFERENCE Headlamp Switch Connector-Pin SJB Connector-Pin Circuit C205-4 C2280d-24 1399 (DB/WH) C205-9 C2280d-7 1400 (TN/WH) C205-5 C2280d-26 1401 (BK/LG) C205-10 C2280d-8 1402 (RD/WH) Are the resistances less than 5 ohms? Yes : GO to H11 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  7. H7 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (LIGHT SENSOR) Key in OFF position. Disconnect: Light Sensor (J286. Measure the resistance between the light sensor C286-4, circuit 1205 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to H8. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  8. H8 CHECK CIRCUIT 1416 (YE/WH) FOR A SHORT TO VOLTAGE Disconnect: SJB C2280d. Key in ON position. Measure the voltage between the light sensor C286-2, circuit 1416 (YE/WH), harness side and ground. Is any voltage present? Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. No : GO to H9.
  9. H9 CHECK CIRCUIT 1416 (YE/WH) FOR AN OPEN Key in OFF position. Measure the resistance between the SJB C2280d-14, circuit 1416 (YE/WH), harness side and the light sensor C286-2, circuit 1416 (YE/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to H10. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  10. H10 CHECK FOR VOLTAGE TO THE LIGHT SENSOR Connect: SJB C2280d. Key in ON position. Place the headlamp switch in the AUTOLAMPS ON position. Measure the voltage between the light sensor C286-2, circuit 1416 (YE/WH) and ground. Is the voltage approximately 5 volts? Yes : INSTALL a new light sensor. CLEAR the DTCs. REPEAT the self-test. No : GO to H11.
  11. H11 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-233027) . TEST the system for normal operation. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.