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Nissan-Datsun Truck Armada 2WD V8-5.6L (VK56DE) U CODE

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Nissan-Datsun Truck Armada 2WD V8-5.6L (VK56DE) U CODE 21
Bose Audio
U1240 SWITCH CONN
Description
U1240 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simultaneously, without fail, with the
malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.
Self-diagnosis results display item
Base Audio
U1243 DISPLAY UNIT
Description
DTC Logic
Diagnosis Procedure
Regarding Wiring Diagram information, See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Diagrams/Electrical
Diagrams/Base Audio.
1.CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Testing and
Inspection/Component Tests and General Diagnostics/Power Supply And Ground Circuit/Display Unit/Base Audio.
Is inspection result OK?
YES - GO TO 2.
NO - Repair malfunctioning parts.
2.CHECK CONTINUITY OF COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector and AV control unit connector.
Nissan-Datsun Truck Armada 2WD V8-5.6L (VK56DE) U CODE 22
3. Check continuity between display unit harness connector M93
(A) terminals 11, 22 and AV control unit harness connector M44
(B) terminals 56, 44.
4. Check continuity between display unit harness connector M93
(A) terminals 11, 22 and ground.
Are continuity results as specified?
YES - GO TO 3.
NO - Repair harness or connector.
3.CHECK COMMUNICATION SIGNAL
1. Connect display unit connector and AV control unit connector.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 terminal 11 and ground with an oscilloscope or CONSULT-III.
Are voltage readings as specified?
YES - GO TO 4.
NO - Replace AV control unit. See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Radio/Stereo/Service and Repair/AV
Control Unit/Base Audio.
4.CHECK COMMUNICATION SIGNAL
Nissan-Datsun Truck Armada 2WD V8-5.6L (VK56DE) U CODE 23
Check signal between display unit harness connector M93 terminal
22 and ground with an oscilloscope or CONSULT-III.
Are voltage readings as specified?
YES - Inspection End.
NO - Replace display unit. See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Radio/Stereo/Service and Repair/Display
Unit/Base Audio.
Without Navigation
U1243 DISPLAY UNIT
Description
DTC Logic
Diagnosis Procedure
Regarding Wiring Diagram information, See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Diagrams/Electrical
Diagrams/Bose Audio/Without Navigation.
1.CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Testing and
Inspection/Component Tests and General Diagnostics/Power Supply And Ground Circuit/Display Unit/Bose Audio/Without Navigation.
Is inspection result OK?
YES - GO TO 2.
NO - Repair malfunctioning parts.
2.CHECK CONTINUITY OF COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector and AV control unit connector.
Labels:
Location: Uhlersdorf 11, 07570 Harth-Pöllnitz, Germany

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