Description

Infiniti G35 Coupe 2004 Service Manual – SRS System

I’ve seen too many guys crack open an air bag module without pulling the battery negative and letting the system discharge. That’s a good way to get a face full of nylon and powder. The 2004 Infiniti G35 Coupe Service Manual for the Supplemental Restraint System (SRS) is 60 pages of the exact step sequence, wiring callouts, and diagnostic flowcharts that Infiniti authorized dealerships use. This is not a reprint of some generic manual that tells you to “disconnect the battery” without giving you the 3-minute wait time and the specific tool required to disarm the system. Every page in this factory document was written by the engineers who designed the car, and it shows in the torque specs, the pin-out tables, and the precaution notes printed in bold on page 3.

SRS Precautions: Why Page 3 Saves Your Ass

Page 3 of this manual lists three separate precaution sections: SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” general precautions, service precautions, and battery service precautions. If you skip reading paragraph 2 under the service precautions, you’ll miss the warning about handling a live inflator module. I don’t care if you’ve done ten air bag jobs – the plastic connector locks change year to year. The manual tells you to point the module away from your body, keep it on a clean bench, and never measure resistance across a squib with a standard DMM. That kind of detail keeps your teeth where they belong.

Wiring Diagram – SRS – (Page 12): The Real Diagnostic Backbone

You cannot guess your way through an SRS fault code. The wiring diagram on page 12 is a full color-coded schematic of every sensor, squib, and control unit path. Need to know which wire from the front impact sensor feeds pin 18 on the SRS control unit? It’s labeled right there. I’ve used this diagram to bypass a broken dash harness on a salvage-title car without killing the air bag system. The manual also includes a separate schematic on page 11 for the whole restraint system layout, so you see the physical location of the side curtain air bag module before you pull the headliner. That’s production line knowledge, not aftermarket speculation.

7 Diagnostic Procedures for Real-Time Trouble Codes

From Diagnostic Procedure 1 (SRS operation check, page 18) all the way through Procedure 8 (warning lamp won’t turn on, page 36), this manual gives you a step-by-step sequence that matches symptom to root cause. Procedure 4 continues from Procedure 2 on page 26 – a flow that checks the entire front air bag circuit. You don’t need a $2000 scan tool for every step; the manual includes a self-diagnosis mode without CONSULT-II starting on page 17. It tells you how to read the flash codes from the “AIR BAG” warning lamp and interpret the blink pattern using the chart on page 31. That’s factory-level troubleshooting you can do with a paper clip and a notepad.

Tools You Need: Special Service Tools Listed on Page 4

The Preparation section (page 4) lists special service tools like the air bag deployment tool (KV99107200 or equivalent). I don’t recommend substituting a jumper wire and a car battery – I’ve seen that go wrong at a shop in Houston. The manual also calls out commercial service tools you can buy off the shelf if you’re a home garage guy. You need a torque wrench that reads in inch-pounds for the spiral cable mounting screws, and the manual gives you the exact torque value. Follow the tool list, and you won’t snap a plastic tab or mis-align the clock spring.

Does This Manual Cover the Spiral Cable and Passenger Air Bag Module?

Yes. Separate sections for driver air bag module (page 37), spiral cable (page 39), and front passenger air bag module (page 41). Each section includes removal steps that tell you to disconnect the negative battery cable and wait 3 minutes, then a full installation sequence with alignment marks. If you’re swapping a steering wheel and need to recenter the spiral cable, the manual shows you the rotation procedure with the front wheels straight ahead. Missing that step means you tear the ribbon cable on the first full lock, and then you’re buying a $400 part instead of a $40 manual.

Source Validity: OEM Factory Print, Not a Third-Party Copy

I don’t trust aftermarket manuals that water down the electrical schematics. This document is a direct scan of the Infiniti factory service manual – revision April 2004 for the 2003 G35 Coupe. It carries the Nissan/Infiniti SRS section number SRS-1. I’ve compared it to the paper binder I used at the Nissan dealership in 2005, and the content is identical. The wiring diagrams are the same ones the factory techs used to develop diagnostic Procedure 3. If you’re rebuilding a wrecked G35 Coupe or chasing an intermittent air bag light, you need this level of fidelity.

FAQ

Does this manual show the exact location of the SRS control unit in the G35 Coupe?

Yes, the Component Parts Location diagram on page 10 identifies the control unit under the center console, the front side air bag sensors, and the side curtain air bag modules.

I have a 2003 Infiniti G35 Coupe – will this 2004 manual still work?

The OCR header on page 1 says “2003 G35 Coupe,” and the revision date is April 2004. Infiniti rarely changed the SRS hardware between the 2003 and 2004 model years for the Coupe body style. The wiring diagram for the SRS section (page 12) covers pins and connectors that match the 2003 service bulletin I used on a customer’s car last month. If you want absolute certainty, check the connector part numbers on your car against the illustrations – but I’ve found this manual works for both years. For other systems like the automatic climate control, see the Infiniti G35 Coupe 2003 Automatic Air Conditioner Service Manual – Section: Oper”>separate A/C manual. Also look at the Infiniti G35 2003 Driver Information System Service Manual”>driver info system manual and the INFINITI G35 Coupe 2003 Wiper Washer Horn Service Manual”>wiper/washer manual for related electrical repairs. For broader automotive repair standards, check the Automotive Industry Overview”>automotive industry best practices and Manual Transmission”>transmission service guides.

You’ve read the list of precautions. You’ve seen the diagnostic procedures. You know the wiring diagram is factory-authentic. Don’t go into an SRS job blind – Access the Factory Manual and keep it on your tablet while you work. That 60 pages will pay for itself the first time you diagnose a code without guessing.