VW TRANSPORTER 2003 – 2.5 l/65 kW direct injection turbo diesel, engine code AYY (dropside only) . Wiring diagrams, Pin Connector, Location

Wiring Diagram VW TRANSPORTER 2003 - Battery - alternator - starter

A	Battery
B	Starter
C	Alternator
C1	Voltage regulator
D	Ignition/starter switch
SA1	Fuse -1- on battery fuse box
SA5	Fuse -5- on battery fuse box
T1	Single connector, behind relay plate
T1g	Single connector, behind relay plate
T2j	2-pin connector, behind relay plate
1	Earth strap, battery - body
2	Earth strap, gearbox - body
C10	Positive (+) connection -1- (30), in headlight wiring harness
*	Only models with manual gearbox
---	Only models with automatic gearbox fuse

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - exhaust gas recirculation - charge pressure control solenoid valve - commencement of injection valve - intake manifold flap change-over valve - additional engine management

J248	Diesel direct injection system control unit, in engine compartment, left
J317	Terminal 30 voltage supply relay
N18	Exhaust gas recirculation valve
N75	Charge pressure control solenoid valve
N108	Commencement of injection valve
N239	Intake manifold flap change-over valve *
S102	Engine control unit fuse
S117	Control element fuse
T3x	3-pin connector, behind relay plate
T10a	10-pin connector, on engine front
T121	121-pin connector
F25	Connection -1-, in diesel direct injection system wiring harness
F26	Connection -2-, in diesel direct injection system wiring harness
*	Only models from June 2000

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - idling switch - kick-down switch - accelerator pedal position sender - pedal switch

F	Brake light switch
F4	Reversing light switch
F8	Kick-down switch
F36	Clutch pedal switch
F47	Cruise control system brake pedal switch (diesel direct injection system)
F60	Idling switch
G79	Accelerator pedal position sender
J248	Diesel direct injection system control unit, in engine compartment, left
T2v	2-pin connector, behind relay plate
T12	12-pin connector, behind relay plate
T121	121-pin connector
TV5	Terminal 15a junction box, green
D52	Positive (+) connection (15a), in engine compartment wiring harness
*	Only models with manual gearbox
**	Only models with ESP
***	Only models without ESP

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - intake manifold pressure sender - intake manifold temperature sender - terminal for data bus - immobilizer

G71	Intake manifold pressure sender
G72	Intake manifold temperature sender
M22	Brake and tail light bulb, right
J104	ABS with ESP control unit, in engine compartment, left
J248	Diesel direct injection system control unit, in engine compartment, left
J362	Immobilizer control unit, behind dash panel insert, right
T1c	Single connector, behind relay plate
T2n	2-pin connector
T2o	2-pin connector
T2p	2-pin connector
T2q	2-pin connector
T2r	2-pin connector
T2s	2-pin connector
T2v	2-pin connector, behind relay plate
T8c	8-pin connector, up to August 1999
T10	10-pin connector, from September 1999
T88	88-pin connector
T121	121-pin connector
TV11	Terminal 54 junction box, orange
TV16	Terminal for data bus, No. 5 on relay location or behind relay plate
D73	Positive (+) connection (54), in engine compartment wiring harness
**	Only models with ESP
---	Only models with automatic gearbox
-••-	Only models from September 1999

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - coolant temperature senders - bonnet contact switch - oil level/oil temperature sender

F266	Bonnet contact switch
G2	Coolant temperature sender
G62	Coolant temperature sender
G266	Oil level/oil temperature sender**
J248	Diesel direct injection system control unit, in engine compartment, left
T2x	2-pin connector, behind relay plate
T3f	3-pin connector
T3x	3-pin connector, behind relay plate
T121	121-pin connector
12	Earth point, in engine compartment, left
85	Earth connection -1-, in engine compartment wiring harness
*	Only models up to September 2000
**	Only with flexible service interval display
***	Only models up to September 2000

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - fuel temperature sender - modulating piston movement sender - metering adjuster - fuel shut-off valve

G81	Fuel temperature sender
G149	Modulating piston movement sender
J248	Diesel direct injection system control unit, in engine compartment, left
N109	Fuel shut-off valve
N146	Metering adjuster
T1l	Single connector, behind relay plate, air conditioner shut-off
T1o	Single connector, behind relay plate, air conditioner readiness
T10a	10-pin connector, on engine front
T121	121-pin connector
F28	Connection -3-, in diesel direct injection system wiring harness

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - needle lift sender - engine speed sender - air mass meter

G28	Engine speed sender
G70	Air mass meter
G80	Needle lift sender
J248	Diesel direct injection system control unit, in engine compartment, left
T2a	2-pin connector, on engine front
T3g	3-pin connector, on engine front
T5a	5-pin connector
T8d	8-pin connector, behind relay plate
T121	121-pin connector
TV13	Terminal for speed signal, blue
F35	Connection -4-, in engine compartment wiring harness
---	Only models with automatic gearbox fuse
*	Only models up to March 2000

Wiring Diagram VW TRANSPORTER 2003 - Diesel direct injection system control unit - cruise control system switch - glow plugs - engine

E45	Cruise control system switch
E227	Cruise control system (CCS) button (Set)
J52	Glow plug relay
J248	Diesel direct injection system control unit, in engine compartment, left
Q6	Glow plugs - engine
T4f	4-pin connector, behind relay plate
T4h	4-pin connector, behind steering column switch trim
T5e	5-pin connector, on engine front
T121	121-pin connector
TV2	Terminal 30 junction box, red
A32	Positive (+) connection (30), in dash panel wiring harness
F31	Connection (glow plugs - engine), in diesel direct injection system wiring harness

Wiring Diagram VW TRANSPORTER 2003 - Continued circulation of coolant - speedometer sender - fuel gauge sender - coolant shortage indicator sender

F18	Radiator fan thermo-switch
F95	Thermo-switch for continued coolant circulation
G	Fuel gauge sender
G17	Ambient temperature sensor
G22	Speedometer sender
G32	Coolant shortage indicator sender
T1p	Single connector, behind relay plate
T1q	Single connector, behind relay plate
V51	Continued coolant circulation pump
18	Earth point, on engine block
131	Earth connection -2-, in engine compartment wiring harness
***	Only models up to September 2000

Wiring Diagram VW TRANSPORTER 2003 - Dash panel insert - oil pressure and coolant warning - fuel gauge - coolant temperature gauge - oil level warning lamp

F1	Oil pressure switch
G1	Fuel gauge
G3	Coolant temperature gauge
H3	Buzzer/gong
J285	Control unit with display in dash panel insert
J533	Data bus diagnostic interface, in dash panel insert
K3	Oil pressure warning lamp
K28	Coolant temperature/coolant shortage warning lamp
K38	Oil level warning lamp**
K105	Reserve fuel warning lamp
T32	32-pin connector, blue
T32a	32-pin connector, green
**	Only with flexible service interval display

Wiring Diagram VW TRANSPORTER 2003 - Dash panel insert - speedometer - odometer display - rev. counter - glow period warning lamp - alternator warning lamp - self-diagnosis connection

G5	Rev. counter
G21	Speedometer
J285	Control unit with display in dash panel insert
K2	Alternator warning lamp
K29	Glow period warning lamp
T16	16-pin connector, behind steering column, self-diagnosis connection,
T32	32-pin connector, blue
T32a	32-pin connector, green
TV14	Terminal for self-diagnosis, white
Y4	Odometer display
A76	Connection (diagnosis wire K), in dash panel wiring harness