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Entertainment System - General Information: Other Ford Escape I рестайлинг

Entertainment Systems 24 illustrations ~3479 words

Audio System

Refer to RADIO (Escape) or RADIO (Mariner) for schematic and connector information.

Connector Circuit Reference

Audio Unit Mach 300 C290a

Scheme 21

Scheme 21: Connector Circuit Reference
Scheme 21: Connector Circuit Reference

Audio Unit Mach 300 C290b

Scheme 22

Scheme 22
Scheme 22

Audio Unit C290a

Scheme 23

Scheme 23
Scheme 23

Subwoofer Amplifier C466

Scheme 24

Scheme 24
Scheme 24

LH Front Tweeter C513, RH Front Tweeter C613

Scheme 25

Scheme 25
Scheme 25

LH Front Speaker C523, RH Front Speaker C612, LH Rear Speaker C702, RH Rear Speaker Connector Pins C802

Scheme 26

Scheme 26
Scheme 26

Smart Junction Box (SJB) C2280b

Scheme 27

Scheme 27
Scheme 27

Possible Causes

  1. Circuit 137 (YE/BK) open
  2. Circuit 956 (OG/LG) open
  3. Circuit 694 (BK/LG) open
  4. Circuit 57 (BK) open
  5. Audio unit
  1. Antenna
  2. Antenna cable(s)
  3. Radio frequency interference suppression equipment
  4. Audio unit
  1. Antenna
  2. Antenna cable(s)
  3. Radio frequency interference suppression equipment
  4. Audio unit

Possible Cause

  1. Circuit 176 (PK/LG) open, short to ground, or high resistance
  2. Circuit 179 (OG/RD) open, short to ground, or high resistance
  3. Circuit 187 (DB/OG) open, short to ground, or high resistance
  4. Circuit 189 (TN/LB) open, short to ground, or high resistance
  5. Circuit 800 (GY/LB) open, short to ground, or high resistance
  6. Circuit 801 (TN/YE) open, short to ground, or high resistance
  7. Circuit 802 (OG/RD) open, short to ground, or high resistance
  8. Circuit 803 (BN/PK) open, short to ground, or high resistance
  9. Circuit 804 (OG/LG) open, short to ground, or high resistance
  10. Circuit 805 (WH/LG) open, short to ground, or high resistance
  11. Circuit 811 (DG/OG) open, short to ground, or high resistance
  12. Circuit 813 (LB/WH) open, short to ground, or high resistance
  13. Tweeters
  14. Speakers
  15. Audio unit
  1. Circuit 720 (RD/YE) open
  2. Circuit 169 (LG/BK) open or short to ground
  3. Circuit 172 (LB/RD) open or short to ground
  4. Circuit 174 (GY/BK) open or short to ground
  5. Circuit 694 (BK/LG) open
  6. Subwoofer amplifier
  7. Subwoofer
  8. Audio unit
  1. Circuit 174 (GY/BK) short to power
  2. Circuit 1786 (BN/PK) open
  3. Subwoofer amplifier
  4. Audio unit
  5. SJB

Audio System - Navigation

Refer to RADIO (Escape) or RADIO (Mariner) for schematic and connector information.

  1. Circuit 137 (YE/BK) open
  2. Circuit 956 (OG/LG) open
  3. Circuit 694 (BK/LG) open
  4. Audio unit

Scheme 28

Scheme 28: PINPOINT TEST G: THE AUDIO UNIT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
Scheme 28: PINPOINT TEST G: THE AUDIO UNIT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Scheme 29

Scheme 29
Scheme 29
  1. G1 CHECK THE OPERATION OF THE AUDIO UNIT Key in ON position. Turn on the audio unit. Is the audio unit display illuminated? Yes : GO to G2. No : GO to G4 .
  2. G2 CHECK FOR SOUND COMING FROM THE AUDIO SPEAKERS Verify that sound is coming from the audio speakers. Is there sound coming from the audio speakers? Yes : GO to G3. No : GO to «PINPOINT TEST K»(ref-232292-S06758933212006051600000) .
  3. G3 CHECK THE AUDIO UNIT CONTROLS AND FEATURES REFER to the for audio system controls. Verify that the controls and features operate correctly. Do the controls and features operate correctly? Yes : The system is operating normally at this time. No : If all of the controls and features are inoperative, GO to G4. If some of the controls and features are inoperative, REMOVE the audio unit. REFER to «AUDIO UNIT»(ref-232286) . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
  4. G4 CHECK THE VOLTAGE AT THE AUDIO UNIT Key in OFF position. Disconnect: Audio Unit C229a. Key in ON position. Measure the voltage between the audio unit C229a-1, circuit 956 (OG/LG), harness side and ground; and between the audio unit C229a-3 circuit 137 (YE/BK), harness side and ground. Are the voltages greater than 10 volts? Yes : GO to G5. No : REPAIR the circuit(s) in question. TEST the system for normal operation.
  5. G5 CHECK THE AUDIO UNIT GROUND CIRCUIT FOR OPENS Key in OFF position. Measure the resistance between the audio unit C229a-6, circuit 694 (BK/LG), harness side and ground. Is the resistance less than 5 ohms? Yes : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair. No : REPAIR circuit 694 (BK/LG). TEST the system for normal operation.
  1. Circuit 690 (GY) short to ground, short to power, or open
  2. Circuit 694 (BK/LG) open
  3. Circuit 798 (LG/RD) short to ground, short to power, or open
  4. Circuit 799 (OG/BK) short to ground, short to power, or open
  5. Circuit 832 (LB/PK) short to ground, short to power, or open
  6. Circuit 833 (TN) short to ground, short to power, or open
  7. Circuit 856 (VT) short to ground, short to power, or open
  8. Circuit 956 (OG/LG) open
  9. Circuit 1068 (LG/BK) short to ground, short to power, or open
  10. CD changer
  11. Audio unit
  12. Audio control protocol (ACP) module

Scheme 30

Scheme 30: PINPOINT TEST H: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
Scheme 30: PINPOINT TEST H: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32
  1. H1 CHECK THE VOLTAGE TO THE CD CHANGER Key in OFF position. Disconnect: CD Changer C3028. Key in ON position. Turn the audio unit on. Measure the voltage between the CD changer C3028-9, circuit 956 (OG/LG), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to H2. No : REPAIR the circuit. TEST the system for normal operation.
  2. H2 CHECK CIRCUIT 694 (BK/LG) FOR AN OPEN Key in OFF position. Measure the resistance between the CD changer U3028-3, circuit 694 (BK/LG), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to H3. No : REPAIR the circuit. TEST the system for normal operation.
  3. H3 CHECK THE AUDIO CIRCUITS BETWEEN THE COMPONENTS FOR AN OPEN Disconnect: Audio Unit C229c. Measure the resistance between the CD changer, harness side and the audio unit, harness side; and between the audio unit, harness side and ground as follows: RESISTANCE SPECIFICATIONS CD Changer-Pin Audio Unit-Pin Circuit C3028-11 C229c-11 798 (LG/RD) C3028-5 C229c-5 799 (OG/BK) C3028-12 C229c-12 832 (LB/PK) C3028-6 C229c-6 690 (GY) C3028-8 C229c-8 1068 (LG/BK) C3028-7 C229c-7 833 (TN) C3028-1 C229c-1 856 (VT) Are the resistances less than 5 ohms between the audio unit and the CD changer, and greater than 10,000 ohms between the audio unit and ground? Yes : GO to H4. No : REPAIR the circuit(s) in question. TEST the system for normal operation.
  4. H4 CHECK THE AUDIO CIRCUITS FOR A SHORT TO POWER Disconnect: Audio Unit C229c. Key in ON position. Measure the voltage between the CD changer, harness side and ground as follows: RESISTANCE SPECIFICATIONS CD Changer-Pin Circuit C3028-11 798 (LG/RD) C3028-5 799 (OG/BK) C3028-12 832 (LB/PK) C3028-6 690 (GY) C3028-8 1068 (LG/BK) C3028-7 833 (TN) C3028-1 856 (VT) Is any voltage present? Yes : GO to H5. No : REPAIR the circuit(s) in question. TEST the system for normal operation.
  5. H5 CHECK THE VOLTAGE TO THE CD CHANGER Key in OFF position. Connect: Audio Unit C229c. Key in ON position. Turn the audio unit on. Measure the voltage between the CD changer C3028-8, circuit 1068 (LG/BK), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to H6. No : REMOVE the audio unit. REFER to «AUDIO UNIT»(ref-232286) . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
  6. H6 CHECK CIRCUIT 1068 (LG/BK) FOR A SHORT TO POWER Key in OFF position. Measure the voltage between the CD changer C3028-8, circuit 1068 (LG/BK), harness side and ground. Is any voltage present? Yes : GO to H7. No : REMOVE the CD changer. SEND it to an authorized audio system repair facility. REFER to «AUDIO UNIT»(ref-232286) . TEST the system for normal operation after the repair.
  7. H7 CHECK THE AUDIO UNIT Disconnect: Audio Unit C229c. Measure the voltage between the CD changer C3028-8, circuit 1068 (LG/BK), harness side and ground. Is any voltage present? Yes : GO to H8. No : SEND the audio unit to an authorized repair facility. TEST the system for normal operation after the repair.
  8. H8 CHECK THE AUDIO CONTROL PROTOCOL MODULE Disconnect: Audio Control Protocol (ACP) Module C2294b. Measure the voltage between the CD changer C3028-8, circuit 1068 (LG/BK), harness side and ground. Is any voltage present? Yes : REPAIR circuit 1068 (LG/BK). TEST the system for normal operation. No : INSTALL a new audio control protocol (ACP) module. REFER to «NAVIGATION SYSTEM»(ref-232295) . TEST the system for normal operation.
  1. CD changer
  1. Antenna
  2. Antenna cable(s)
  3. Radio frequency interference suppression equipment
  4. Audio unit

Scheme 33

Scheme 33: PINPOINT TEST J: POOR RECEPTION
Scheme 33: PINPOINT TEST J: POOR RECEPTION

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35
  1. J1 CHECK THE ANTENNA GROUND Key in OFF position. Measure the resistance between the antenna base and the battery ground cable. Is the resistance less than 5 ohms? Yes : GO to J2. No : MAKE sure that the antenna is mounted securely to a clean surface. TEST the system for normal operation.
  2. J2 CHECK THE ANTENNA SHIELDING Disconnect the antenna lead-in cable from the audio unit. Measure the resistance between the antenna shielding and ground. Is resistance less than 5 ohms? Yes : GO to J3. No : INSTALL a new antenna lead-in cable. REFER to «ANTENNA»(ref-232293) . TEST the system for normal operation.
  3. J3 CHECK THE ANTENNA CABLE FOR AN OPEN Disconnect the antenna lead-in cable from the antenna base. Measure the resistance between the audio unit antenna connector center conductor and the antenna connector center conductor. Is the resistance less than 5 ohms? Yes : GO to J4. No : INSTALL a new antenna lead-in cable. REFER to «ANTENNA»(ref-232293) . TEST the system for normal operation.
  4. J4 CHECK THE ANTENNA CABLE FOR A SHORT Measure the resistance between the audio unit cable center conductor and the cable outer shield. Is the resistance greater than 10,000 ohms? Yes : GO to J5. No : INSTALL a new antenna lead-in cable. REFER to «ANTENNA»(ref-232293) . TEST the system for normal operation.
  5. J5 SUBSTITUTE THE ANTENNA Substitute a known good antenna base. Ground the antenna base to an unpainted metal surface on the vehicle. Key in START position. Verify the operation of the audio unit. Is the reception clear? Yes : INSTALL a new antenna base. REFER to «ANTENNA»(ref-232293) . TEST the system for normal operation. No : GO to J6.
  6. J6 SUBSTITUTE THE AUDIO UNIT Key in OFF position. Substitute a known good audio unit. Key in START position. Verify the operation of the audio unit. Is the reception clear? Yes : SEND the original audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair. No : GO to «PINPOINT TEST N»(ref-232292-S06021669712006051600000) .
  1. Circuit 176 (PK/LG) open, or short to ground
  2. Circuit 179 (OG/RD) open, or short to ground
  3. Circuit 187 (DB/OG) open, or short to ground
  4. Circuit 189 (TN/LB) open, or short to ground
  5. Circuit 800 (GY/LB) open, or short to ground
  6. Circuit 801 (TN/YE) open, or short to ground
  7. Circuit 802 (OG/RD) open, or short to ground
  8. Circuit 803 (BN/PK) open, or short to ground
  9. Circuit 804 (OG/LG) open, or short to ground
  10. Circuit 805 (WH/LG) open, or short to ground
  11. Circuit 811 (DG/OG) open, or short to ground
  12. Circuit 813 (LB/WH) open, or short to ground
  13. Circuit 172 (LB/RD) open, or short to ground
  14. Circuit 174 (GY/BK) open, or short to ground
  15. Tweeters
  16. Speakers
  17. Audio unit

Scheme 36

Scheme 36: PINPOINT TEST K: POOR QUALITY/DISTORTED SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)
Scheme 36: PINPOINT TEST K: POOR QUALITY/DISTORTED SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)

Scheme 37

Scheme 37
Scheme 37
  1. K1 CHECK FOR OPENS OR SHORTS TO GROUND IN THE SUSPECT SPEAKER(S) AND CIRCUITS Key in OFF position. Disconnect: Audio Unit C229a. NOTE: If the speakers have poor quality/distorted sound, only a measurement between each circuit and ground needs to be taken. Measure the resistance between each pair of circuits at the audio unit; and between each audio unit circuit listed and ground as follows: RESISTANCE SPECIFICATIONS Speaker Connector Circuit Connector Circuit RH front (including tweeter) C229b-6 811 (DG/OG) C229b-5 805 (WH/LG) LH front (including tweeter) C229b-2 813 (LB/WH) C229b-1 804 (OG/LG) RH rear C229b-8 803 (BN/PK) C229b-7 802 (OG/RD) LH rear C229b-3 801 (TN/YE) C229b-4 800 (GY/LB) Are the resistances between each pair of pins 3.5 - 4.5 ohms for the rear speakers or 4.5 - 5.5 ohms for the front speakers, and greater than 10,000 ohms between the speaker(s) and ground? Yes : For all speakers with poor quality/distorted/no sound, REMOVE the audio unit. REFER to «AUDIO UNIT»(ref-232286) . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair. All others, GO to K3 . No : GO to K2.
  2. K2 CHECK FOR OPENS OR SHORTS TO GROUND IN THE SPEAKER CIRCUITS Disconnect: Suspect Speaker. Measure the resistance between the audio unit or the tweeter speaker, harness side and the suspect speaker connector harness side; and between the suspect speaker circuit harness side and ground as follows: RESISTANCE SPECIFICATIONS Suspect Speaker Audio Unit Connector Tweeter Connector Door Speaker Connector Circuit RH front tweeter C229b-5 C613-1 - 805 (WH/LG) RH front tweeter C229b-6 C613-2 - 811 (DG/OG) LH front tweeter C229b-1 C513-1 - 804 (OG/LG) LH front tweeter C229b-2 C513-2 - 813 (LB/WH) RH front door - C613-4 C612-2 189 (TN/LB) RH front door - C613-3 C612-1 187 (DB/OG) LH front door - C513-3 C523-1 176 (PK/LG) LH front door - C513-4 C523-2 179 (OG/RD) RH rear C229b-7 - C802-1 802 (OG/RD) RH rear C229b-8 - C802-2 803 (BN/PK) LH rear C229b-4 - C702-1 800 (GY/LB), 802 (OG/RD) LH rear C229b-3 - C702-2 801 (TN/YE), 803 (BN/PK) Are the resistances less than 5 ohms between the components, and greater than 10,000 ohms between the suspect speaker and ground? Yes : INSTALL a new door speaker or tweeter as necessary. REFER to «SPEAKERS»(ref-232294) . TEST the system for normal operation. No : REPAIR the circuit(s) in question. TEST the system for normal operation.
  3. K3 CHECK FOR AN AUDIO SIGNAL OUTPUT TO THE SPEAKER WITH POOR QUALITY/DISTORTED SOUND OR NO SOUND Disconnect: Suspect Speaker(s). Connect: Audio Unit. Key in ON position. Turn on the audio unit. For both a suspect tweeter and front door speaker in the same door, measure the voltage between the LH front tweeter C513-1, circuit 804 (OG/LG), harness side and the LH front tweeter C513-1, C513-2, circuit 813 (LB/WH), harness side; or between the RH front tweeter C613-1, circuit 805 (WH/LG), harness side and the RH front tweeter C613-2, circuit 811 (DG/OG), harness side. All others, measure the AC voltage between pin 1 and pin 2 of the speaker as follows: VOLTAGE SPECIFICATIONS Suspect Speaker Tweeter Connector Door Speaker Connector Circuit RH front tweeter C613-1 - 805 (WH/LG) RH front tweeter C613-2 - 811 (DG/OG) LH front tweeter C513-1 - 804 (OG/LG) LH front tweeter C513-2 - 813 (LB/WH) RH front door - C612-2 189 (TN/LB) RH front door - C612-1 187 (DB/OG) LH front door - C523-1 176 (PK/LG) LH front door - C523-2 179 (OG/RD) RH rear - C802-1 802 (OG/RD) RH rear - C802-2 803 (BN/PK) LH rear - C702-1 800 (GY/LB), 802 (OG/RD) LH rear - C702-2 801 (TN/YE), 803 (BN/PK) Is there a fluctuating AC voltage? Yes : For both a suspect tweeter and front door speaker in the same door, INSTALL a new tweeter. REFER to «SPEAKERS»(ref-232294) . TEST the system for normal operation. All others, INSTALL a new door speaker. REFER to «SPEAKERS»(ref-232294) . TEST the system for normal operation. No : For a suspect front door speaker with the tweeter in that door functioning correctly, INSTALL a new tweeter. REFER to «SPEAKERS»(ref-232294) . TEST the system for normal operation. For all others, REMOVE the audio unit. REFER to «AUDIO UNIT»(ref-232286) . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
  1. Circuit 720 (RD/YE) open
  2. Circuit 174 (GY/BK) open, short to power, or short to ground
  3. Circuit 169 (LG/BK) open, short to power, or short to ground
  4. Circuit 172 (LB/RD) open, short to power, or short to ground
  5. Circuit 694 (BK/LG) open
  6. Subwoofer amplifier
  7. Subwoofer
  8. Audio unit

Scheme 38

Scheme 38: PINPOINT TEST L: THE SUBWOOFER IS INOPERATIVE
Scheme 38: PINPOINT TEST L: THE SUBWOOFER IS INOPERATIVE

Scheme 39

Scheme 39
Scheme 39

Scheme 40

Scheme 40
Scheme 40

Scheme 41

Scheme 41
Scheme 41

Scheme 42

Scheme 42
Scheme 42
  1. L1 CARRY OUT THE SPEAKER WALK-AROUND TEST - CHECK THE SUBWOOFER OPERATION Key in ON position. Turn the audio unit on. Carry out the speaker walk-around test by pressing preset buttons 3 and 6 simultaneously. Does the subwoofer sound operate correctly? Yes : The system is operating OK. No : GO to L2.
  2. L2 CHECK CIRCUIT 174 (GY/BK) FOR VOLTAGE Key in OFF position. Disconnect: Subwoofer Amplifier. Key in ON position. Turn the audio unit on. Measure the voltage between the subwoofer amplifier C466-1, circuit 174 (GY/BK), harness side and ground. Is the voltage greater than 4.1 volts? Yes : GO to L3. No : GO to L7 .
  3. L3 CHECK CIRCUIT 720 (RD/YE) FOR VOLTAGE Key in OFF position. Measure the voltage between the subwoofer amplifier C466-5, circuit 720 (RD/YE), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to L4. No : REPAIR the circuit. TEST the system for normal operation.
  4. L4 CHECK CIRCUIT 694 (BK/LG) FOR AN OPEN Measure the resistance between the subwoofer amplifier C466-2, circuit 694 (BK/LG), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to L5. No : REPAIR the circuit. TEST the system for normal operation.
  5. L5 CHECK FOR AN OUTPUT SIGNAL FROM THE AUDIO UNIT Key in ON position. Turn the audio unit on. Measure the voltage between the subwoofer amplifier C466-7, circuit 169 (LG/BK), harness side and the subwoofer amplifier C466-8, circuit 172 (LB/RD), harness side. Is there a fluctuating AC voltage? Yes : REMOVE the subwoofer amplifier. REFER to «AUDIO UNIT»(ref-232286) . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair. No : GO to L6.
  6. L6 CHECK CIRCUITS 172 (LB/RD) AND 169 (LG/BK) FOR AN OPEN OR SHORT TO GROUND Key in OFF position. Disconnect: Audio Unit C229d. Measure the resistances between the subwoofer amplifier C466-7, circuit 169 (LG/BK), harness side and the audio unit C229d-1, circuit 169 (LG/BK), harness side; and between the subwoofer amplifier C466-7, circuit 169 (LG/BK), harness side and ground. Measure the resistances between the subwoofer amplifier C466-8, circuit 172 (LB/RD), harness side and the audio unit C229d-2, circuit 172 (LB/RD), harness side; and between the subwoofer amplifier C466-8, circuit 172 (LB/RD), harness side and ground. Is the resistance less than 5 ohms between the subwoofer amplifier and the audio unit, and greater than 10,000 ohms between the subwoofer amplifier and ground? Yes : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair. No : REPAIR the circuit. TEST the system for normal operation.
  7. L7 CHECK CIRCUIT 174 (GY/BK) FOR AN OPEN Measure the resistance between the subwoofer amplifier C466-1, circuit 174 (GY/BK), harness side and the audio unit C229d-3, circuit 174 (GY/BK), harness side; and between the audio unit C229d-3, circuit 174 (GY/BK), harness side and ground. Is the resistance less than 5 ohms? Yes : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair. No : REPAIR the circuit. TEST the system for normal operation.
  1. Circuit 174 (YE) short to power
  2. Circuit 1786 (BN/PK) open
  3. Subwoofer amplifier
  4. Audio unit
  5. SJB

Scheme 43

Scheme 43
Scheme 43

Scheme 44

Scheme 44
Scheme 44
  1. M1 CHECK THE SUBWOOFER Key in OFF position. Disconnect: Subwoofer Amplifier C466. Key in START position. Is the symptom still present? Yes : GO to M2. No : GO to M3 .
  2. M2 CHECK THE AUDIO UNIT Key in OFF position. Disconnect: PCM Relay C1016. Key in START position. Measure the voltage between the subwoofer amplifier C466-1, circuit 174 (GY/BK), harness side and ground. Is any voltage present? Yes : GO to M3. No : REMOVE the subwoofer amplifier. REFER to «AUDIO UNIT»(ref-232286) . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
  3. M3 CHECK CIRCUIT 1786 (BN/PK) FOR VOLTAGE Key in OFF position. Disconnect: Audio Unit C229c. Key in START position. Measure the voltage between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and ground. Is the voltage greater than 10 volts? Yes : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair. No : GO to M4.
  4. M4 CHECK CIRCUIT 1786 (BN/PK) FOR AN OPEN AND A SHORT TO GROUND Key in OFF position. Disconnect: SJB C2280e. Measure the resistance between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and the SJB C2280e-17, circuit 1786 (BN/PK), harness side; and between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and ground. Is the resistance less than 5 ohms between the SJB and the audio unit, and greater than 10,000 ohms between the audio unit and ground? Yes : GO to M5. No : REPAIR the circuit. TEST the system for normal operation.
  5. M5 CHECK FOR SJB OPERATION Key in OFF position. 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-232247) . 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. Circuitry
  2. Antenna
  3. Antenna cable(s)
  4. Radio frequency interference suppression equipment
  5. Audio unit

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