Re:Re:ABS Error - Stop Lamp Circuit (C1016/DTC 16)

Ok thanks for that, I do understand they will present a reduce voltage drop. But looking at the circuit diagram the only monitoring point I can see is the Green/White wire, this implies it's looking for a voltage to indicate the brake lights are on. Voltage drop on a cable is a factor of load / distance / distance to monitoring point and cable specification. So let's assume with the correct bulbs fitted we are looking for 10v at the Green/White wire when the brake is applied.

So if this is correct the problem could be a cable break which is resulting in the Green/white monitoring cable not seeing the correct voltage?

The only things that make me doubt it's a simple voltage monitoring circuit are:

If it monitors the brake lights you should be able to start the vehicle and drive without an ABS fault UNTIL you apply the brakes.
If both bulbs are blown it will never know you applied the brakes, unless it also monitors the brake pedal as a separate function, but again no fault would appear until the brakes are applied.

Humm, I don't understand.

Whilst voltage detection is simple, it does not work when the brake pedal is not pressed. Therefore it's more likely to be current leakage based.

The abs unit leaks current through the brake bulbs, just enough to see they are there but not enough to light them. LEDs, being diodes, need a forward voltage ( around 2volts) for them to conduct. Therefore they are high resistence until they conduct, the abs thinks they have failed.

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Thanks for explaining Martin. So SSS360 problem is likely to be a break in the cable between the connection point of sensor Green/White and the bulb holder, a fact confirmed by the PO mod wire bypassing this route.
Time to get the tester out and find the break, or add your own PO fix and add a second wire from the E142 terminal to the same bulb holder. If that don't work it's something else.
Good luck.

Thanks both for the input! I didn't have chance to look any further but I think Scimike is right. Hopefully I'll just be able to complete the circuit and it will work.

OK, to close this topic off in the hope this may help somebody in the future...

The ABS unit does leak current to verify the brake bulbs are alive and well; the ABS unit wiring joins the brake light circuit between the brake light switch and the brake bulbs (in reality this is within the plug that goes into the brake switch). As such, if you have a wiring issue and the ABS circuit isn't "plumbed" into the brake circuit to verify the current your ABS won't work and the ABS error light will stay illuminated.

This will show as error code DTC C1016/DTC 16. Note that this isn't shown from the normal diagnostic port; if you haven't got a genuine Suzuki diagnostic reader you can read the code by shorting the circuit on the exposed ABS connector under the dash near the fuse box (this is described well in a Big Jimny wiki article). The ABS error light will then show a series of flashes for you to interpret (details in the workshop manual).

What I also learned is that the green/white wire that goes off to the ABS unit also links the brake light circuit into your ECU. I don't have a code reader to plug in, but I would bet money on it flagging an error there too.

I've fixed the problem by cutting into my new brake light cable and closing the circuit with the green/white cable running back off to the ABS/ECU.

No more error light and working ABS - problem solved! :woohoo: