Which test connector is it which on 1994 Honda Civic DX?


#1

On this 1994 Honda Civic, the Haynes repair manual has a black and white photograph which shows the DLC (Data Link Connector) as a two-pin connector to jumper to cause the check engine light to flash trouble codes. The wiring diagram shows the DLC having THREE wires: One has power, one goes to ground, and one goes to the PCM (engine computer). /// Under the right corner of the dash are two BLUE connectors, a two-pin, and a three-pin. Their wire colors do not match the colors on the wiring diagrams for the DLC, nor the SRS (air bag) “SCS Service Check Connector”. I DO NOT want to, haphazardly, put multimeter test voltage into the SRS system, in an effort to find where the wires go, if the connectors are SRS connected. Resolution?


#2

Your first mistake is believing a wiring diagram out of a Haynes manual. These manuals aren’t very accurate when it comes to wiring diagrams. They sometimes don’t even show electrical components that are in the circuit. Been burned by that a couple of times.

Everything I have shows you jump the two pin connector to get the Check Engine light to flash DTC’s. They even warn you not to jump the three pin SRS connector.

Tester


#3

We had a 93 Civic once and the P2 connector had two wires to it and if I remember right, it also had a dust cover.


#4

I did further research, and it seems like it’s a confusion of terms. The blue two-pin connector is the “service check connector” which one jumpers which causes, both, the check engine light and the SRS light to flash their respective trouble codes. The three-pin DLC (DATA Link Connector) is, evidently, for use with a Honda scan tool. On other OBD1 (On-Board Diagnostic) cars, two DLC terminals are jumpered to cause the check engine light to flash the engine trouble codes. The DTC code flashed by the SRS was DTC 1-1 “Open in the driver’s airbag inflator, or increased resistance”. Possible cause, somebody installed (messily) a Viper 1 Security System.