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1993 Volvo 940 sedan speedometer and odometer stopped working 900

posted by  B.B. on  Sat Aug 26 20:03 CST 2023
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Hello Habib,

Here's the info to troubleshoot the speedo wiring
Give an email address and I'll send the Instrument cluster and speedo
schematics.

Here is the outline:

Connector D (5 pins) Harness to sensor

1 Sensor Speedo (GN-W) to C1 pin 12 to speedo sensor pin 2 (GN-W) +
2 Sensor Speedo (BN-W) to C1 pin 11 to speedo sensor pin 1 (BN)
3 Ground (BN) to 31/31 (gnd buss in fuse block) - 31/10
(Ground by passengers right shin)
4 Supply 15+ (BL-R)
Connector C1 is in the dash harness near the driver rear view mirror

Connector D Instrument Cluster

S- to D2 Note: has unknown series component
S+ to D1
+ to D4 series fuse 11/41 (common to speedo, fuel, tach, temp gauges)

Ground via Connector A:2 (Br-GR) reference ground Left A post
(Connector A (8-pin)

You can look for a faulty spread open pin at Connector D
Or a break in the circuits from the connectors to the speedo pins
If there are any tracks that go to a through hole pin and a track on the back side of the flex card and out again through another through hole connection.
be aware the solder connections can be ratty, requiring a jumper tacked onto the
top of the flex card.
Look at that mystery series component S- at D2, what is it?
See if it has gone open with your ohmmeter.

To fix a chronic dead fuel gauge here I found an loose instrument cluster connector pin from the fuel sensor, AND a bad solder joint at a through hole on the instrument cluster flex board that required a jumper.

Look at the flex board circuit tracks and connectors first.

I hope this helps, Bill






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