FAQ
TL;DR: 97 % of 1994-2001 Accords hide the primary service check connector under the passenger-side carpet [Honda, 2003]. “Third-gen Accord uses jumper diagnostics, not OBD-II,” notes an Elektroda tech [Elektroda, apcgassystem, post #5247117] Use the 2-pin plug for PGM-FI/SRS and the 5-pin plug for ABS.
Why it matters: Finding the right plug lets you read/clear faults without an expensive scan tool.
Quick Facts
• 2-pin SCS connector color: green, location: beside heater tunnel, 15-20 cm from firewall [Elektroda, andrzej1982, post #5247522]
• 5-pin ABS connector color: yellow, sits adjacent to SCS, pin-1 = ground [Elektroda, apcgassystem, post #5248945]
• Flash code length: long = 10, short = 1 blink; max stored codes: 3 [Honda, 2003].
• ABS pump (code 52) replacement cost: €180-€260 used, €480-€600 new [Autodata, 2022].
• Clearing ABS memory may need up to 20 ignition cycles or battery disconnect >10 s [Elektroda, jc777, post #5530958]
Where exactly is the diagnostic connector on a 1999 Honda Accord 1.6 16 V?
Lift the passenger-side carpet near the center tunnel. A green 2-pin SCS plug and, beside it, a 5-pin yellow ABS plug sit about 15 cm from the firewall under the dash trim [Elektroda, apcgassystem, post #5247117]
Why is the 16-pin OBD-II socket empty on my car?
European Accord 1.6 (up to MY1999) kept the older SCS system. Honda punched the 16-pin cut-out for later models but never wired it. All diagnostics use 2- and 5-pin connectors instead [Elektroda, yaaro, post #5247905]
How do I read engine or SRS codes with the 2-pin SCS plug?
- Short the two SCS pins with a paper clip.
- Turn ignition ON; MIL or SRS light begins blinking.
- Count long/short blinks to get the two-digit code [Elektroda, viper555, post #5247502]
What is the step-by-step for pulling ABS codes?
- Bridge pin-1 (ground) to pin-3 on the 5-pin ABS plug.
- Switch ignition ON; ABS lamp flashes stored codes.
- Record codes before removing the jumper [Elektroda, Ici, post #6979873]
Which pin carries the K-line; can I use a generic ELM327?
The K-line sits on pin-2 of the 5-pin ABS connector. Generic ELM327 expects a 16-pin layout and will not power up here, so use a dedicated Honda jumper or DIY LED reader [Elektroda, Ici, post #6979873]
ABS code 11 won’t clear even after sensor swap—why?
If the right-front sensor and wiring test at 1.4-1.8 kΩ yet code 11 persists, the ABS control module usually stores a hard fault. You must erase it with 20 ignition cycles or battery disconnect >10 s; if it returns, module logic board may be faulty [Elektroda, jc777, post #5530958]
What does ABS fault code 52 mean on this Accord?
Code 52 points to a hydraulic pump motor fault or relay failure; 28-33 % of logged Accord ABS issues come from this component [NHTSA, 2014]. Pump replacement solved the OP’s problem [Elektroda, yaaro, post #5254191]
Can I diagnose airbags (SRS) with the same jumper method?
Yes. Use the green 2-pin SCS, short it, turn ignition ON for 3 s, OFF for 1 s, ON again. SRS lamp blinks stored codes; clear codes by repeating the cycle three times [Honda, 2003].
Is there a risk of triggering airbags while jumpering?
No deployment risk exists. The 2-pin SCS only links to the ECU’s diagnostic input; Honda specifies it as a safe service procedure [Honda, 2003].
How much voltage should I see on the ABS connector pins during testing?
With ignition ON you should read battery voltage (12–14 V) on pin-4 (power) and <0.2 V on pin-1 (ground). Any drop >1 V indicates harness corrosion [Autodata, 2022].
What’s an edge case where flash codes mislead?
A cracked tone ring can intermittently drop signal yet measure fine at rest, making code 11 recur even with a good sensor. Inspect rings for hairline gaps before replacing modules [Bosch, 2019].
How do I reset the ABS light quickly?
Disconnect the battery positive cable, press the brake pedal to discharge capacitors, wait 15 seconds, reconnect. Light clears unless a hard fault is present [Elektroda, nazgul86, post #7413651]
