All Blog Entries

Introduction
The Gauge Cluster suffers from ageing capacitors as many ECUs in the NSX do. Leaking capacitors at the gauge cluster is a serious issue. Acid near the warning indicator circuit causes shorts and even potentially lead to a fire. Same as with the other capacitor issues, a replacement should be considered before the unit fails.

Diagnostic
First signs are a non-accurate speed indication or a permanently lit brake light warning even though bulbs and wiring are ...

Introduction

Around the 100.000 to 150.000 km range the first illumination and indicator bulbs in the Gauge Cluster start to fail. Replacing individual bulbs isn't economical considering the effort to get the cluster out of the car. Replacing all bulbs is the preferred route (except for AT vehicles - which will be explained below).

JDM 1997 AT Cluster

All bulbs can be replaced without disassembling the cluster, except ...

Introduction
The NSX's Gauge Cluster is a good example for a nice and simple design - it features a symmetric layout with one large dial on each side, accompanied by two small dials. These main functionalities are realized:

• Speed dial (country specific labeling and range)
• Tachometer (model specific range)
• Temperature, oil pressure and fuel gauge
• Shift indicator (AT only)
• ~30 indicator lights (some model and country specific)

Variations and Build ...

Introduction
Failure of the NSX active speakers is a common fault, especially for the early build years. The modules are class-D switching amplifiers with a MOS-FET driver bridge for low impedance (2 Ω) speakers. The amplifier can be divided into these main sections:

• Output drivers (MOS-FET transistors) and Filter (coils)
  Transistors used are from either STMicroelectronics (ST) or International Rectifiers (I▽R) with the BOSE-internal part number 137110
  One

...

Introduction
The Supplementary Restrain System (SRS) ECU suffers from ageing capacitors the same way as many other ECUs in the NSX. Two things makes it a special issue: The SRS is a safety device and a permanently lit warning light means failing the regular vehicle checks in most countries.
Especially the first generation ECUs (cars with only a driver's Airbag) tend to fail by shorting an important MOS-FET inside the housing which complicates repairs.

Diagnostic
Due ...