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Home >> Infiniti >> 1997 >> I30 Base, Automatic, RE4F04A >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Multiplex Control System >> Self-Diagnostic System >> Diagnostics Using Indicator Lights >> Mode I (LAN Communication)
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Mode I (LAN Communication)

  1. This mode checks the communication between the Body Control Module (BCM) and each Local Control Unit (LCU). If a malfunction is detected, self-diagnostic indicator lights (interior dome and step lights) will flash a 2-digit Diagnostic Trouble Code (DTC). See LAN COMMUNICATION TROUBLE CODES  table.
  2. To enter on-board diagnostic Mode I, turn ignition off. Set headlight switch and rear window defogger switch in OFF position. Ensure all doors are closed. Set interior light switch in center "O" position.
  3. Turn ignition on, then off. Repeatedly press rear window defogger switch to ON position more than 10 times in 10 seconds, ending in the OFF position. Self-diagnostic indicator lights (interior dome and step lights) should illuminate. Turn ignition switch to ON position within 5 seconds after self-diagnostic indicator lights illuminate.
  4. Indicator lights should turn off. Self-diagnostic indicator lights should illuminate for 2 seconds and turn off for 2 seconds, indicating successful entry to self-diagnostic Mode I. Self-diagnostic indicator lights will now flash DTCs.
  5. The self-diagnostic indicator lights will flash the first digit. After a 1.5-second pause, the second digit will be flashed. See Fig 1 .
  6. Record DTCs, and perform appropriate repair procedure. See DIAGNOSTIC TESTS  . To exit diagnostic mode, turn ignition off. Diagnostic mode is automatically canceled if left unattended for 10 minutes after DTCs are retrieved. To clear diagnostic codes, turn ignition off and remove fuse No. 56 (7.5-amp) located in fuse and fusible link box.
Fig 1: Reading DTCs Using Interior Lights
G96G06340Courtesy of NISSAN MOTOR CO., U.S.A.
LAN COMMUNICATION TROUBLE CODES

Trouble Codes LCU No. Failure Description
11 N/A N/A
24 01 (1) Communication Fault
25 01 (2) Data Line "A" - No Response
26 01 (3) Data Line "B" - No Response
34 02 (1) Communication Fault
35 02 (2) Data Line "A" - No Response
36 02 (3) Data Line "B" - No Response
41 03 (1) Communication Fault
42 03 (2) Data Line "A" - No Response
43 03 (3) Data Line "B" - No Response
44 04 (1) Communication Fault
45 04 (2) Data Line "A" - No Response
46 04 (3) Data Line "B" - No Response
54 05 (1) Communication Fault
55 05 (2) Data Line "A" - No Response
56 05 (3) Data Line "B" - No Response
(1) See COMM FAIL under DIAGNOSTIC TESTS  .
(2) See A-LINE NO RESPONSE under DIAGNOSTIC TESTS  .
(3) See B-LINE NO RESPONSE under DIAGNOSTIC TESTS  .
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