oxo
Club Member
Posts: 19
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Post by oxo on Nov 10, 2019 20:52:21 GMT
RAV4, MK1, 3 door, manual, UK model. Silly mistake, under duress and sleep deprivation.  I got a bit of sparking from the battery + terminal, that should have been a warning, but I didn’t realise my mistake until battery had been fully connected for a minute or two. I’ve now got a brand new Varta battery. Good news is the engine starts and drives. Bad news is a lot electrics don’t work: Indicators work on hazard, but not left or right individually. Clocks don’t work, including lumination. Headlights work, tail-lights don’t. Also not working - Interior fan, central locking, wipers. There’s no doubt more, but that’s all I can remember. I pray there aren’t terminal consequences to this, and it’s an easy fix like fuses/relays. Owners manual states four locations for fuses/relays: 1/ Close to the drivers right knee under a cover, a dozen fuses here, none appear blown: PWR outlet, CIG, SRS-ACC, Wiper, ECU-IG, Turn & Gauge, AM1, Stop, Tail, Mir-Htr, SRS-B, Horn, Defog. 2/ Passenger side footwell, under cover, there’s just one relay (as far as I can tell, just that). Black and marked 3B08 90987-04002 056700-6780 12v Denso. Then two further boxes on the right side of the engine bay. 3/ A larger box with a mix of fuses and relays. Some of these have a clear top, and as far as I can tell, the metal elements inside appear not to be blown, and nor do some of the smaller fuses: CDS Fan, RDI Fan, HTR, ALT, H-LP (RH), H-LP (LH), Main No.1, ALT-S, HAZ, EF1, Dome, IGN, AM2. One smaller fuse has blown, marked Radio 15A. There’s also 3 larger relays: E/G Main (grey) 3B08 85925-17010 056700-7770 12v Denso, ST (purple) 3B06 28300-10020 156700-0503 12v Denso, H-LP (brown) 3B07 90987-02006 056700-6912 12v Denso. 4/ Smaller box which has only two of it’s sockets filled with relays. FAN1 (green) I can’t get this one out, in fear of breaking it, so I can’t read the s/n. FAN2 (black) 3B06 90987-02012 156700-9870 12v Denso. Is there any way of knowing if these relays are damaged, other than swapping them for new ones? Should I swap them all, or one by one, and which ones first? Any advice appreciated. This RAV4 is my only mode of transport right now, need to get it fixed PDQ. |
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Post by unclebob on Nov 10, 2019 21:40:31 GMT
Does the red terminal on the battery have a little box attached to it ? Some Toyota vehicle have a fusible link in the box and blows to save the wiring ?
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Post by philip42h on Nov 10, 2019 21:43:25 GMT
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Post by three5 on Nov 10, 2019 21:47:47 GMT
Does the red terminal on the battery have a little box attached to it ? Some Toyota vehicle have a fusible link in the box and blows to save the wiring ? "Looking" at the fuses is not foolproof. Get hold of a multi-meter and take each fuse out in turn. Check the fuse on the ohms setting and ( with the fuse out ) check that you have one side of the fuse carrier live. We should be able to narrow things down a bit if you can test all the fuses and report back. |
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oxo
Club Member
Posts: 19
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Post by oxo on Nov 10, 2019 22:04:52 GMT
Does the red terminal on the battery have a little box attached to it ? Some Toyota vehicle have a fusible link in the box and blows to save the wiring ? I used a VW Polo battery (MK5 2010), Bob. The original RAV4 battery was end-of-life, wouldn’t hold charge. It was just a bodge, to get me through a few days, until a new battery arrived, well that was the plan… I don’t remember any red box, but after I put the battery back in the Polo, it seemed to work fine. Thanks, I’ll give it read. Does the red terminal on the battery have a little box attached to it ? Some Toyota vehicle have a fusible link in the box and blows to save the wiring ? "Looking" at the fuses is not foolproof. Get hold of a multi-meter and take each fuse out in turn. Check the fuse on the ohms setting and ( with the fuse out ) check that you have one side of the fuse carrier live. We should be able to narrow things down a bit if you can test all the fuses and report back. I don’t have a multi-meter and wouldn’t know how to use one.  |
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oxo
Club Member
Posts: 19
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Post by oxo on Nov 10, 2019 22:10:51 GMT
Just remembered, windows don't operate and no interior lighting, wipers, to add to the list.
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Post by philip42h on Nov 10, 2019 22:18:34 GMT
The key paragraph of the info I linked to is as follows:
So, you shouldn't expect many fuses to 'blow'. The lighting circuits should all be good. But there is a risk that you could have 'fried' any electronic components that don't have reverse polarity protection.
Step one is to look for that protective fuse as mentioned above and in Uncle Bob's post ... It could be built into the connector for the positive lead ... ?
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oxo
Club Member
Posts: 19
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Post by oxo on Nov 10, 2019 22:27:44 GMT
The key paragraph of the info I linked to is as follows: So, you shouldn't expect many fuses to 'blow'. The lighting circuits should all be good. But there is a risk that you could have 'fried' any electronic components that don't have reverse polarity protection. Step one is to look for that protective fuse as mentioned above and in Uncle Bob's post ... It could be built into the connector for the positive lead ... ? I can't find such a fuse. If there was one, might that not stop all juice from the battery? It does fire up, and headlights work. |
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Post by unclebob on Nov 10, 2019 23:29:00 GMT
Is there anything under the red cover other than thick cables ?  |
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oxo
Club Member
Posts: 19
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Post by oxo on Nov 10, 2019 23:42:39 GMT
Is there anything under the red cover other than thick cables ? I couldn't see anything tonight, but I will double check when there's better light tomorrow. |
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Post by philip42h on Nov 11, 2019 8:07:36 GMT
The key paragraph of the info I linked to is as follows: So, you shouldn't expect many fuses to 'blow'. The lighting circuits should all be good. But there is a risk that you could have 'fried' any electronic components that don't have reverse polarity protection. Step one is to look for that protective fuse as mentioned above and in Uncle Bob's post ... It could be built into the connector for the positive lead ... ? I can't find such a fuse. If there was one, might that not stop all juice from the battery? It does fire up, and headlights work. I can't fault your logic ... you do have power from the battery to the engine and lights and that clearly is good. How many leads come from the positive connector? If one only then there can't be a fuse in the connector; if there are two or more there still could be - so worth checking in the daylight ... Also, the hazard lights function irrespective of the position of the ignition switch, while the turn indicators only function with the ignition turned on ... is it safe to assume that you attempted to start the car with the battery connected the wrong way around? You also say "One smaller fuse has blown, marked Radio 15A" - have you replaced that fuse yet? |
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Post by unclebob on Nov 11, 2019 8:27:57 GMT
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Post by shcm on Nov 12, 2019 8:08:37 GMT
But there is a risk that you could have 'fried' any electronic components that don't have reverse polarity protection. In thirty years of ECU design experience, I've never seen an OEM (and that includes Toyota's) ECU hardware design requirements spec, that didn't have reverse battery protection as a requirement. (On very rare occasions, batteries can arrive at the vehicle production line reverse charged, which, without rev bat protection, would be a very expensive fault when the battery is fitted. I know of only one case, but I'm sure it's happened more than once. Reverse bat protection is done for that reason and also, of course, for situations such as these.) The "One big protection fuse" I feel is slightly misleading. If you look at a typical vehicle wiring diagram, the fuse arrangement is generally a tree like structure, with the larger fuses protecting main feeds, with smaller fuses downstream of those. As has been previously said already, without a multimeter on ohms measurement and a wiring diagram, it's going to take a lot longer to diagnose. Does the Haynes manual cover the MKI? Or spend a few euros and see whether: www.toyota-tech.eu/has the MKI wiring diagram. The site certainly has them for other models. |
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Post by widge on Nov 12, 2019 22:01:09 GMT
RAV4, MK1, 3 door, manual, UK model. Silly mistake, under duress and sleep deprivation. I got a bit of sparking from the battery + terminal, that should have been a warning, but I didn’t realise my mistake until battery had been fully connected for a minute or two. I’ve now got a brand new Varta battery. Good news is the engine starts and drives. Bad news is a lot electrics don’t work: Indicators work on hazard, but not left or right individually. Clocks don’t work, including lumination. Headlights work, tail-lights don’t. Also not working - Interior fan, central locking, wipers. There’s no doubt more, but that’s all I can remember. I pray there aren’t terminal consequences to this, and it’s an easy fix like fuses/relays. Owners manual states four locations for fuses/relays: 1/ Close to the drivers right knee under a cover, a dozen fuses here, none appear blown: PWR outlet, CIG, SRS-ACC, Wiper, ECU-IG, Turn & Gauge, AM1, Stop, Tail, Mir-Htr, SRS-B, Horn, Defog. 2/ Passenger side footwell, under cover, there’s just one relay (as far as I can tell, just that). Black and marked 3B08 90987-04002 056700-6780 12v Denso. Then two further boxes on the right side of the engine bay. 3/ A larger box with a mix of fuses and relays. Some of these have a clear top, and as far as I can tell, the metal elements inside appear not to be blown, and nor do some of the smaller fuses: CDS Fan, RDI Fan, HTR, ALT, H-LP (RH), H-LP (LH), Main No.1, ALT-S, HAZ, EF1, Dome, IGN, AM2. One smaller fuse has blown, marked Radio 15A. There’s also 3 larger relays: E/G Main (grey) 3B08 85925-17010 056700-7770 12v Denso, ST (purple) 3B06 28300-10020 156700-0503 12v Denso, H-LP (brown) 3B07 90987-02006 056700-6912 12v Denso. 4/ Smaller box which has only two of it’s sockets filled with relays. FAN1 (green) I can’t get this one out, in fear of breaking it, so I can’t read the s/n. FAN2 (black) 3B06 90987-02012 156700-9870 12v Denso. Is there any way of knowing if these relays are damaged, other than swapping them for new ones? Should I swap them all, or one by one, and which ones first? Any advice appreciated. This RAV4 is my only mode of transport right now, need to get it fixed PDQ. Hi I have just messaged you with some info that might help. Dave |
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Post by unclebob on Nov 13, 2019 17:25:14 GMT
All gone very quite let’s hope it’s good news 👍🏻
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