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No voltage from ignition to starter troubleshoot (1999 S70)

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70, V70 AWD
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1997 - 2004 C70

cn90
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Joined: Wed Mar 31, 2010 9:54 am
Year and Model: 2004 V70 2.5T
Location: Omaha NE
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cn90

Re: No voltage from ignition to starter troubleshoot (1999 S

Post by cn90 » Sat Mar 09, 2013 12:37 pm

Another thought re alarm system. I am not familiar with the inner workings of the S70 alarm system but in general, there are 2 aspects:
1. Sensors (hood, door, motion etc.)
2. Module (rarely goes wrong)

The sensor issue: have you looked into hood/door sensors? Maybe they need a quick fix?
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

Whitebird
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Joined: Tue Jun 14, 2011 2:35 pm
Year and Model: 1999 S70 Base manual
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Whitebird

Re: No voltage from ignition to starter troubleshoot (1999 S

Post by Whitebird » Sat Mar 09, 2013 1:50 pm

cn90 wrote:You have 2 options:

1. Look at the Alarm Module and somehow bypass only the module, which means a jumper between B21 and B22 in the photo.
This will effectively bypass the Alarm but not the neutral safety switch.
Ok, I will try that. I had a terrible time trying to get the connectors loose from the module yesterday; I gave up when I had this thought: "This module is a computer chip thingy. How do I know jumpering B:21 & B:22 would even work? Maybe it grounds B:21 when it reads a voltage on B:22 instead."

Any tips on disconnecting the module? I can't see obvious tabs on the connector and nothing I push seems to release it.
cn90 wrote:2. Buy used Alarm Module on ebay for cheap.
I'll definitely look there. Thinking about it now, I know the module is not totally fried, because its other functions still work (door locks, fuel cap door).
cn90 wrote:Another thought re alarm system. I am not familiar with the inner workings of the S70 alarm system but in general, there are 2 aspects:
1. Sensors (hood, door, motion etc.)
2. Module (rarely goes wrong)

The sensor issue: have you looked into hood/door sensors? Maybe they need a quick fix?
I hadn't considered this because I thought, based on the schematic, that only the ECM affects whether the alarm module will ground B:21. This is my first time using schematics, so I'm very new at this. Do you think another sensor that isn't on the schematic could affect the B:21 grounding?

cn90
Posts: 6671
Joined: Wed Mar 31, 2010 9:54 am
Year and Model: 2004 V70 2.5T
Location: Omaha NE
Has thanked: 0
Been thanked: 124 times
United States of America
cn90

Re: No voltage from ignition to starter troubleshoot (1999 S

Post by cn90 » Sat Mar 09, 2013 4:48 pm

If you go to ebay and search "98 Volvo S70 Alarm Module", you will see some Modules for sales.
This will give you an idea how to disconnect it.
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

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