LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2003 >> Altima SE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Connector Identification >> Main Harness
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Main Harness

Fig 1: Identifying Main Harness Routing
G00103858Courtesy of NISSAN MOTOR CO., U.S.A.
MAIN HARNESS CONNECTOR IDENTIFICATION

Connector Name (1) Color Number Of Pins Description
M1 Brown 2 Left Tweeter
M2 White 6 To R1 (Without Vanity Mirror Lamps)
M2 White 8 To R1 (With Vanity Mirror Lamps)
M3 White 8 Fuse Block
M4 White 16 Fuse Block
M5 White 3 Illumination Control Switch
M6 Gray 6 TCS ON/OFF Switch (With TCS)
M7 White 18 To E28
M8 White 16 To D2
M9 White 12 To D1
M10 Yellow 4 To E29
M11 White 16 To B1
M12 White 16 To B2
M13 Blue 4 Heated Seat Relay
M14 Brown 2 Security Indicator Lamp
M15 White 3 Auto Light Sensor (With Auto Lights)
M16 Brown 20 Joint Connector No. 1
M17 Pink 20 Joint Connector No. 2
M18 Brown 24 BCM
M19 White 16 BCM
M20 White 16 BCM
M21 White 12 BCM
M22 White 16 Data Link Connector
M23 White 24 Instrument Cluster
M24 Brown 24 Instrument Cluster
M25 Black 2 Ignition Key Illumination
M26 White 4 Key Switch & Key Lock Solenoid
M27 White 8 Immobilizer Control Unit
M28 White 16 Combination Switch
M29 Yellow 6 Combination Switch
M30 Gray 8 Combination Switch
M31 Gray 10 Shift Lock Control Unit (With A/T)
M32 White 2 In-Vehicle Sensor (With Auto A/C)
M33 White 2 Intake Sensor (With Auto A/C)
M34 White 12 A/T Device
M35 Yellow 28 Air Bag Diagnosis Sensor Unit
M36 Black 1 Parking Brake Switch
M37 White 6 Left Heated Seat Switch
M38 Black 2 Power Socket
M39 White 3 Air Mix Door Motor (With Auto A/C)
M40 White 3 Mode Door Motor
M41 White 6 Fan Switch (With Manual A/C Or Heater Only)
M42 White 6 Rear Window Defogger Switch
M43 White 10 Audio Unit
M44 White 6 Audio Unit
M45 White 16 Audio Unit
M46 White 4 Not Used
M47 Black 2 Not Used
M48 White 2 Antenna Amplifier
M49 Gray 20 A/C Auto Amp. (With Auto A/C)
M50 Gray 16 A/C Auto Amp. (With Auto A/C)
M51 White 12 A/C Control Unit (With Manual A/C Or Heater Only)
M52 White 3 Thermo Control Amplifier (With Auto A/C)
M53 White 2 Intake Sensor (With Manual A/C)
M54 White 2 Trunk Lid Opener Cancel Switch
M55 White 8 Hazard Switch
M56 Black 2 Cigarette Lighter
M57 ..... ..... Body Ground
M58 White 3 Intake Door Motor
M59 Brown 2 Glove Box Lamp
M60 Yellow 4 Front Passenger Air Bag Module
M61 ..... ..... Body Ground
M62 White 2 Blower Motor
M63 Brown 4 Blower Motor Resistor (With Manual A/C)
M64 White 4 Fan Control Amp. (With Auto A/C)
M65 Black 2 Sunload Sensor (With Auto A/C)
M66 Brown 20 Joint Connector No. 3
M67 White 10 To E131
M68 White 10 To B102
M69 White 18 To B104
M70 White 6 To F58
M71 White 24 To F59
M72 Brown 2 Right Tweeter
M73 White 16 To B103
M74 White 10 To D102
M75 White 8 To D101
M76 White 6 Right Heated Seat Switch
(1) For locations, see Fig 1.