Description

Infinity G35 Coupe Service Manual – What You Actually Get

You’ve got a Infinity G35 Coupe in the bay with a lighting issue, maybe both lows are out, maybe the daytime lights won’t fire. You pull out a generic aftermarket manual and it says “check fuse” – that’s three minutes you’ll never get back. This Service Manual from AutoRepairManuals is the OEM factory document, 206 pages, nothing rewritten by some copywriter who’s never held a multimeter. It’s the same book the dealership techs used in 2003 when this car was new. I’ve been turning wrenches for 28 years, and I can tell you: skipping the factory wiring diagrams is how you short a BCM or set off an airbag. This manual has the SRS precautions and the CAN communication unit pinouts that keep you from making a bad day worse.

Precautions That Save You from Setting Off the Airbag

Page 5 devotes a full section to SRS (Supplemental Restraint System) precautions. If you’ve never worked on a Nissan/Infinity CAN system, you need to read that block before you unplug anything. The manual spells out exactly which connectors you can’t probe with a test light without deploying the bag. I’ve seen guys do it – it’s loud, expensive, and you’ll be filling out incident paperwork. This isn’t a suggestion; it’s the factory procedure. Follow it.

Wiring Diagrams: Not the Generic Kind

The wiring section for the HEADLAMP (FOR USA) covers the CAN Communication System Description, schematic, and actual terminal reference values for the BCM and IPDM E/R. Need to know what pin 17 on the IPDM should read with the low beams on? It’s in there. The manual gives you the wiring diagrams for both USA and Canada (Daytime Light System). That means you can troubleshoot a DTRL control unit without guessing. If you’ve been fighting a headlamp that won’t turn off, turn to page 27 – the trouble diagnosis flowchart tells you exactly which voltage to expect at each connector.

Headlamp Diagnostics: From USA to Canada Spec

Two separate sections for USA and Canada because the Daytime Light System adds a control unit and different signal paths. The manual walks you through Headlamp HI Does Not Illuminate (Both Sides), RH HI Does Not Illuminate But RH LO Illuminates – that kind of specificity. It even explains the EXTERIOR LAMP BATTERY SAVER CONTROL and how the CAN bus decides when to kill power. That saves you from chasing a phantom draw that’s actually factory logic.

Aiming Adjustment: Not Just ‘Point It at a Wall’

Precise aiming adjustment procedure using an adjustment screen and the light/dark borderline. If you got a used G35 with mismatched lamps, you need the factory method from page 27-28. It lists the preparation steps, the required distance, and the vertical/horizontal tolerances. Don’t try to eyeball xenon headlamps – you’ll blind oncoming traffic and fail inspection.

Bulb Replacement: Component and Part Locations

Most guys think swapping a bulb is a five‑minute job. On a G35 Coupe, the low beam (upper) and high beam/fog lamp (lower) are separate housings, and there’s a parking lamp and front turn signal that share connectors. The manual gives you the Bulb Replacement table along with removal and installation steps for the entire headlamp assembly. Includes the Servicing to Replace Headlamps When Damaged section – useful if you’re repairing collision damage.

Need the companion manuals for drivetrain work? Check out the 2003 G35 Coupe Engine Mechanical Service Manual for engine overhaul or the Infinity FX35 FX50 2009 Body Control System Electrical for newer body electronics. If you’re also working on a lawn tractor, the White Outdoor LT-5 700 Series 2005 Service Manual – OEM Factory Specs has that same level of detail. For basic theory on how a Manual Transmission works, Wikipedia is fine – but for factory diagnostics, stick with this manual. And if you need to understand gear ratios, another Manual Transmission resource can help, but keep the Infinity manual open for your actual job.

FAQs

Does this manual cover the engine or transmission?

No – it covers the lighting system exclusively (206 pages).

What about the SRS system – is it safe to work on after I disconnect the battery?

The manual says to wait at least 3 minutes after disconnecting the battery before working on any SRS component. It also lists specific connectors that must be shorted with a jumper wire during diagnosis. I’ve seen guys ignore that and pop a clock spring – don’t be that guy. Page 5 has the full list of precautions, including the “AIR BAG” and “SEAT BELT PRE‑TENSIONER” warnings. If you’re doing any work near the steering column, glovbox, or seat rails, you need that page memorized.

Bottom line: if you’re repairing the lights on a 2003 G35 Coupe and you don’t have the factory procedure, you’re wasting time and risking electrical damage. This 206‑page manual gives you the OEM pinouts, diagnosis flows, and torque specs that aftermarket guides leave out. Stop burning hours on trial‑and‑error. Access the Factory Manual now and use the same documentation the dealership technicians relied on.