Description

Infiniti G35 Coupe Service Manual – Wiper, Washer & Horn (2003)

Let me be straight with you. If you’re working on a 2003 Infiniti G35 Coupe and the wipers stop in the middle of a Texas rainstorm, you don’t need a generic diagram from the internet. You need the factory procedure. This is the Infiniti G35 Coupe Service Manual – the actual Nissan-issued document, 40 pages thick, covering nothing but the wiper, washer, and horn systems. I’ve been turning wrenches for 28 years, and I’ve seen more burned BCMs from people guessing at CAN bus wiring than from actual component failures. This manual stops that guessing cold.

Precautions for SRS: Page 3 Protects Your Back

The first thing you see in this manual is the SRS warning – page 3. If you’re popping the steering wheel or messing near the airbag clockspring, you follow that precaution to the letter. Disconnect the battery, wait the specified time, don’t probe the harness with a test light. This manual spells out the Supplemental Restraint System (SRS) precautions, including the “AIR BAG” and “SEAT BELT PRE-TENSIONER” handling. I’ve had a deputy tech ignore that page and set off a bag in the shop. Not fun. That page alone justifies the price.

Wiring Diagrams: Page 14 and the CAN Bus

Page 14 gives you the full wiring diagram for the wiper system. But it’s not just a colored line drawing – it includes the CAN communication unit breakdown (Type 1 and Type 2, pages 10-11). The Infiniti G35 Coupe uses a BCM and IPDM E/R that talk over the CAN bus. If your low speed works but intermittent doesn’t, you’ll be in the wiring diagram checking the BCM terminals on page 17. The manual lists the reference values for every pin – no oscope required, just a multimeter. That’s the difference between fixing it in an hour and throwing parts.

7 Troubleshooting Routines – Front Wiper Does Not Operate

Page 20 walks you through the diagnostic tree for when the front wiper doesn’t move. You start with the power supply and ground circuit check (page 18), then use CONSULT-II to monitor data and do active tests. The manual covers seven specific failure modes: no operation, incorrect stop position, low only, high only, intermittent not working, intermittent position not adjustable, and wipers not wiping with washer. Each one has its own symptom chart and step sequence. I had a ‘03 G35 come in last month where the intermittent switch wouldn’t adjust – turned out to be a stuck BCM input. The manual’s table on page 27 gave me the exact signal to check.

Component Removal: Wiper Arms, Motor, Nozzles

Pages 28-31 cover the physical removal and installation of the front wiper arms, motor assembly, washer nozzles, and tubes. The adjustment procedure for the wiper arm stop location is on page 28 – you need that if the blades hit the cowl. The manual also includes the washer nozzle adjustment (page 30) and tube layout (page 31). For the DIY guy in his garage: don’t skip the disassembly/assembly steps on page 29. The wiper motor comes apart with a snap ring and a spring – if you misalign the gear, the auto-stop won’t work. This manual shows you the gear orientation.

Who Needs This 40-Page Manual?

If you’re a home garage enthusiast with a 2003 Infiniti G35 Coupe, you need this. The wiper system on these cars is tied to the body control module and the CAN network – not something you can fix with a $25 aftermarket manual that reprints the same generic three-wire motor diagram. The manual is also useful for techs who rarely see Infinitis – I’ve been in shops where the old-timer hands you a Chilton and says “it’s all the same.” No, it’s not. The G35 coupe’s washer and horn circuits share the same fuse block as the wipers, and the IPDM E/R has a specific fail-safe function (page 6) that cuts power if the CAN bus goes down. You need the factory spec.

Source Validity: OEM vs Aftermarket Documentation

I don’t trust aftermarket manuals for any import. They copy wiring colors from another model year, leave out the SRS warnings, and often skip the CONSULT-II active test procedures. This is an original Nissan publication – look at the revision date: 2004 April, for the 2003 model year. It references the exact Infiniti parts and harness connectors. The schematic on page 13 matches the actual car. If you use a knockoff manual, you’ll find yourself chasing a ground that doesn’t exist. Not worth it.

FAQ

Does this manual cover the complete 2003 Infiniti G35 Coupe service?

No. This is a sectional manual covering only the Wiper, Washer & Horn (WW) system. It does not include engine, transmission, or brake sections. If you need the air conditioning or driver information systems, check the related manuals below.

Is the SRS precaution on page 3 sufficient for airbag work?

Yes.

What diagnostic tools does the manual assume I have?

It requires the Nissan CONSULT-II diagnostic tool (or equivalent) for active tests and data monitor. However, many of the troubleshooting steps can be followed with a multimeter and the wiring diagram. The manual includes terminal reference values for BCM and IPDM E/R, so you can measure voltage and continuity without CONSULT-II for simpler checks.

Are the washer nozzle adjustment specs included?

Yes, page 30 gives the washer nozzle adjustment procedure and spray pattern target. The manual also includes the washer tube layout (page 31) for routing replacement lines.

Take my advice – if you’re dealing with any electrical issue on the G35 coupe’s wiper or horn system, get the real paper. I’ve seen too many hack jobs from aftermarket PDFs that leave out the CAN communication details. This manual will sit on your bench next to your impact gun and save you the headache of chasing ghosts. Access the Factory Manual now and keep a copy in your shop tablet.

Related Manuals:

• Infiniti G35 Coupe 2003 Automatic Air Conditioner Service Manual – Section: Oper
• Infiniti G35 2003 Driver Information System Service Manual
• INFINITI G35 Coupe 2003 Supplemental Restraint System SRS Manual

External References: Automotive Industry Overview – Manual Transmission