A nice upgrade for the NB1 is the ability to display the ambient temperature on the clock.
The NB1, the pre-facelift NB, had a small storage compartment next to the radio, with a digital clock beside it. These clocks were also used in other Mazda models, such as the 323 (Protege in North America) and the 626. In total, the following versions were available:
a digital clock only, as in the NB1;
a digital clock with an ambient temperature display;
a trip computer, which could display average and current fuel consumption in addition to the clock and ambient temperature.
That last version is calibrated to the fuel tank capacity and engine type and is therefore not compatible with the NB1.
However, the version with the outside temperature on the display is a nice upgrade that fits well with the NB1’s original interior.
The clock uses a 16-pin connector. The connector that plugs into it is the Sumitomo 6098-1624.
The terminals in this connector are labeled with the letters A through P. Mazda always starts at the top right with A, followed by B below it, C next to A, D below C, and so on.
The connector layout is as follows:
- Wire A is blue with red and is permanently connected to 12 volts;
- Wire B is pink with black and receives 12 volts when the ignition is on;
- Wire D is light green with black and is the positive terminal for the interior lighting;
- Wire E is black and serves as the ground wire;
- Wire G is red with yellow and is connected to the ambient temperature sensor;
- Wire H is yellow with green and is also connected to the ambient temperature sensor;
- Wire O is white with blue and serves as the negative terminal for the interior lighting.
The temperature sensor connector is the Sumitomo 6189-0640. This connector is also used for the ABS sensors and for a number of other connections in the engine compartment.
The temperature sensor can be found under part number: G51861764A, also known as G518-61-764A.
The gauge with the temperature display was used on the higher-end models of the BJ-generation Mazda 323 or Protege and on the GF-generation Mazda 626.
The temperature sensor is mounted between the front bumper and the radiator, in a location where the airflow from driving passes over the sensor. The two wires for that sensor must be routed from the gauge cluster, through the dashboard, to the front of the car. For example, you can run those wires alongside the wire for the hood release. Below is a photo showing the location of the temperature sensor on the MX-5 NC.
Below is a video on this topic
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