Volvo 240 Instrument panel wiring connection at engine conversion

If you want to continue to use the original instrument panel and thus engine malfunction light, oil pressure, tachometer, etc. with an engine conversion then you will have to modify the wiring. This is because the wiring that originally went to the B20, B230 or another engine is no longer connected to anything. With the information in this article, you can keep most of the functionality of the instrument panel which is cost effective and, of course, improves the looks. Below you will find several diagrams with the corresponding pin-out so that you know exactly which cables from the engine should be connected to the corresponding cable from the instrument panel. Should you want to convert the odometer to a GPS model, you can use the LCM GPS Speedo plates. Allows you to easily mount a GPS speedometer in the original Volvo 240 counter.

Volvo 240 1st Gen (1974-1980)

31. This is the 12-pole plug on the back of the instrument panel31. This is the 12 pole plug on the back of the instrument panel 31.1. Yellow - Not used 31.2. Blue/Yellow - Lighting failure indication (Ground). 31.3. White/Red - Indicating high beam (+). 31.4. Red - Alternator indicator light (Ground) (from 31.9) This connection is important in an engine conversion, without an alternator light an alternator will not activate. 31.5. Gray - Brake operation indicator light (Ground) 31.6. Blue - Right blinker indicator light (+) 31.7. Not used 31.8. Green - Right blinker indicator light (+) 31.9. Red - Alternator indicator light, comes from alternator D+ (goes to 31.4) This should also be reconnected 31.10. Yellow - Coolant temperature signal. The simplest thing is to use the Volvo coolant sensor in the new engine and connect or this cable. All you have to do is tap the right size thread and use the original Volvo sensor. 31.11. Black - Oil pressure sensor signal Check that the operation of the old and new sensor is the same. Usually this is an on/off sensor and there is a good chance that the sensor can be used on the new engine. 31.12. Yellow - Overdrive indicator light (+) Comes from the switch
32. This is the 5-pin plug on the back of the instrument panel32.1. Brown - Hand brake indicator light (ground) 32.2. Blue/Red - 12V from fuse 5 (1980 it is fuse 13) 32.3. Black - Choke indicator light (+) 32.4. Gray - Fuel level sensor signal

34. This is the 2-pin plug on the back of the instrument panel 34.1. Red - EGR Switch signal (ground). 34.2. Red - EGR Light (ground)

Volvo 240 (1984-1987 VDO)

31. This is the 12 pole plug on the back of the instrument panel 31.1. Gray - Brake operation indicator light (ground) 31.2. Yellow - Coolant temperature signal. The simplest thing is to use the Volvo coolant sensor in the new engine and connect or this cable. All you need to do is the right size wire 31.3. White/Red - Indicating high beam (+). 31.4. Yellow - Overdrive indicator light (+) Comes from the switch. 31.5. Black - OP light (Ground) 31.6. Red - Air conditioning Relay 31.7. Blue - Right blinker indicator light (+) 31.8. Green - Left blinker indicator light (+) 31.9. White - 12v from fuse 8 goes to clock and tachometer 31.10. Brown - 12v from the lamps 31.11. Red - Alternator indicator light, comes from alternator D+ (ground) This should also be reconnected to the alternator of the new engine 31.12. Blue/Yellow - Lighting control light (ground).
32. This is the 5-pin plug on the back of the instrument panel 32.1. Gray - Fuel level sensor signal 32.2. Brown - Hand brake indicator light (ground). 32.3. Black or Blue - Turbo warning indicator light (ground) (not used at 1987) 32.4. Black - Mass

34. This is the 1-pole plug on the back of the instrument panel for the Overdrive when it is off 1987 Extras 200. Shift indicator

233.1 Blue - Differential speed sensor

233.2 Black - Differential speed sensor

233.3 Red Black - 12V run position of the contact