Nissan Pulsar NX Dome Light Bulb Size

Additional Notes

• The Nissan Pulsar NX dome light specifications reference two bulb types across the 1983-1990 model years: the 158 and the DE3175, both of which conform to ANSI standards applicable to the US and Canadian markets.
• The DE3175 is a festoon-style bulb with a 31mm length and end-cap contacts, operating at 12 volts. Festoon bulbs make electrical contact at each end of the cylindrical housing rather than through a base socket.
• The 158 is a miniature wedge bulb in the T10 form factor, rated at 12 volts and 3 watts. Wedge bulbs rely on the glass envelope's pinched base to make electrical contact, with no separate metal base or end caps.
• The physical contact design of the DE3175 and the 158 are fundamentally different. A festoon bulb seats into spring clips at both ends, while a wedge bulb inserts into a socket that grips its base. These two types are not interchangeable.
• The 1983-1989 Pulsar NX models predominantly use the DE3175 festoon bulb for the dome light, with the sole exception of the 1988 model year, which uses the 158 wedge bulb.
• The 1990 Nissan Pulsar NX also uses the 158 wedge bulb for the dome light, matching the 1988 specification rather than the DE3175 used in most surrounding years.
• Because the 158 and DE3175 require different socket types, a replacement bulb must match the exact size specified for the given model year rather than a neighboring year's specification.