ABS/ASR lights on

[cossie]

The ABS & ASR dash lights of my 93 (Japan version) would come on once the car starts moving after starting (car still runs well and have not experienced limp mode). Asked my friend with a Star to hook it up to check the fault codes.

These came up...
010 Return pump relay A7/3K2, return pump A7/3M1
013 Brake light switch S9/1

005 Max temperature in module box exceeded M2/2

We were able to clear codes 013 & 005, but unable to for code 010. After the reset the ABS/ASR lights are now always on vs. prior to resetting, it does not light up at idle after start-up, only when the car starts moving.

1) If it's the return pump relay by the ABS pump, which of the 2 Bosch relays (currently installed) should I replace? The lower 1 is Bosch 0 332 002 173 (4 pin) & the upper 1 is 0 332 002 197 (7 pin). Opened up both relays too and both seem clean. Can anyone share the MB part numbers for these as well.

2) Since the brake light switch fault came up, is it possible for this to be causing the ABS/ASR lights even though my brake lights work well?

3) Should I worry about code 005? Just worried about the modules

By the way, all 4 wheel sensors are working properly as per Star, upper and lower harnesses have been replaced in 2016.

Thanks for your inputs.

 

[gsxr]

Note that the code numbers also require a module name as well. There are 5 powertrain modules on your car and all of them have a code 005, 010, and 013. However, the description provided identifies the module.

005 (BM/GM) - Max temp exceeded - This is very common. You can generally ignore this code, particularly if it is intermittent. However, you should verify the module box cooling fan/blower is working, and verify the hoses are connected. You can see all of this by looking at the bottom of the CAN box and following the large (~1.5" diameter) hoses in & out.

If 013 (ASR) comes back, replace switch S9/1 and adjust per the FSM. Another common part failure, inexpensive to replace. Yes, this can cause fault lights and either ABS or ASR not functioning, even if your brake lights work normally.

010 (ASR) will require more effort to chase down. Hopefully it's just the relay and not the pump, which might require replacement of the entire ASR unit. See FSM section 42-0800 for more info.

 

[cossie]

Thanks GSXR!

For the S9/1 adjustment, can you share the FSM.

For the relay, there are 2 by the ABS, which 1 do I replace? Do you have the MB part #s for both? Do you think I messed up the relay more when I open it, checked the contact points and sprayed contact cleaner? Before plugging the Star, the ABS/ASR would only light up when the car moves after starting but after cleaning, it's now always on. Given this circumstance, do you think it's the relay at fault? Just trying to keep my hopes high that it's only the relay... fingers crossed!!

 

[gsxr]

See job 42-0040 for the S9/1 R&R. It's an auto-adjust ratcheting switch, fully extend it, then it adjusts itself after installation.

I don't know about the relays - never touched them. I think someone posted info on these relays recently, see if you can find that in a search. I think they are standard cube relays, nothing special?

 

[cossie]

Thanks GSXR.

Does anyone know the correct part # for the relay? I currently have the Bosch counterpart of 0 0154 270 19 (7 contact pins) but in most sites it says "it won't fit your vehicle" while in some sites the correct part is 0 0154 267 19 (6 contact pins). Are they interchangeable?

Anyone kind enough to check if you have the 7 or 6 pin relay and part # please.

Thanks in advance.

 

[gsxr]

EPC shows of 001-542-70-19 as a correct Mercedes p/n for one relay, with 7 pins. And no, these will NOT be interchangeable with a 6-pin relay. The 6-pin relay 001-542-67-19 is for NON-ASR cars (300E, 400E etc).

Looks like the other may be MB # 001-542-65-19. , Bosch # 0-332-002-197.

 

[northNH]

These are the available pair from my ’92 ASR 400E parts car:

 

[cossie]

Thank you NorthNH and GSXR!

NorthNH, my 4 pin relay looks exactly like yours but part# ending in 197. Wonder if it's interchangeable.

 

[northNH]

Looking at the schematic on the relay and the contact numbering I can tell you it is the simplest SPST used by MB.
Contacts labeled: 85, 86, 87 and 30.
I quite sure it will fit and work correctly.

BTW relay very easy to test for functionality with 12V source.

 

[cossie]

UPDATE: put in a new 7 pin relay, the ABS/ASR lights were still on. Drove around for 20mins and still stayed on. Decided to disconnect the battery for 30mins. Upon starting, the engine was misfiring badly but no ABS/ASR lights. After around 5mins of rough idling it cured itself on its own. Drove around for 5 minutes (didn't want to go far with the fear of it stalling). So far all is well, engine is smooth and the ABS/ASR have not lit up since disconnecting the battery. Hope it stays this way!

Is it normal for the engine to bahave like this after the battery "reset"? The way I see it, the ECUs reset and adapts itself to the normal parameters, hence the temporary misfire. As it seems, it may have cured the ABS/ASR issue as well (new relay + battery disconnect). Is this really possible or just a coincidence of another issue popping up (worried about the temporary misfiring after the battery disconnect in this case)?

 

[gsxr]

The misfire is not related to the battery disconnected, it is related to shutting the engine off for 30 mins after running 20 mins. The misfire is related to secondary ignition and is a completely separate (and, sadly very common) issue. Most likely related to caps/rotors/insulators.

Not sure why the ABS/ASR lights are staying off after the battery disconnection, but hey, if it works...!

 

[cossie]

Thanks GSXR. Just now, curious if it was really the faulty relay, I put back the old one and the ABS/ASR came on again. Switched back the new relay, still on. Disconnected the battery and same result, temporary misfire + ABS/ASR lights off. Didn't drive out this time so engine is relatively cold. With this, I can say that disconnecting the battery sometimes does wonders. But then it"s been 2 days only, really hoping all is well now.