Technical Information

Diagnostic - CPU Issues
A CCU with a non-working CPU won't show any signs of life. All display elements, LEDs, buttons and knobs are non-working. When plugged into the vehicle, no initialization motor movements can be recognized. One way to confirm a CPU problem is to check pin 30 of the CPU with an oscilloscope. That pin carries the clock signal and should show a 11.9 MHz wave of 3 V peak-to-peak:

If the CPU is unable to start, the following ...

.. continuation of Radio Head Unit - Repair III

No display - otherwise fully functional
Observed on: 1 USDM Radio
Fixed by: PCB repair, parts replacement
State: Fully understood

A fully working radio with a non-working display. The display was confirmed OK by installing it into a working JDM radio. An investigation showed heavy leakage by capacitor E818:

IC 802 is providing 9 V to the VFD heater circuit ...

Introduction
Issues with the radio head unit is a common fault, affecting nearly all NSX depending on age and climate zone. Capacitor replacement should be the first step to perform, followed by further analysis and repair.

Diagnostic
The following error cases and ways of repairing have been identified so far. Almost all of them are caused by capacitor leakage but not exclusively since the radios suffer from normal wear and tear similar to other consumer audio electronics. ...

Introduction
Failure of the Climate Control Unit (CCU) is a common fault, affecting nearly any NSX. In almost any case, capacitor replacement and track repair will fix all issues. Depending on the state of the PCB, further damage to other components can happen, though.

Diagnostic - Transistor Issues
The following error cases and ways of repairing have been identified so far. These faults can be caused by major acid leakage affecting nearby transistors.

...

Introduction
The NSX Gauge Cluster provides a large number of functions and displays, resulting in roughly 60 pins across two green connectors. Testing all of them manually is a error-prone task, requires special equipment and takes a lot of time. To speed things up, it helps to have a tester that provides all of these functions in a compact way and utilizing the original connectors.

Requirements
A simple user interface. Usage of the original connectors. Adaptable for multiple ...