Is the Central Locking System the same on a 126 comparted to 123? Can a 123 manual be used to trouble shoot the central locking system on a 126 or is there too many differances between the 2.

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84 300D, 82 Volvo 244Gl Diesel

No. 126 has a separate electric vacuum pump for the doors.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

and, it operates with a single line to each door lock actuator. The pump reverses and uses pressure to unlock the doors, but draws vacuum to close them. Its a pretty neat (and simpler) system. And up until late 1983, the drivers door lock was just an electric switch for the system. Later on they added a switch to the trunk lock and a vac line to the drivers door. (so you could unlock the entire car from the trunk as well)

Its a very reliable system, mine has always worked fine except when one actuator got leaky....swapped it out, and all was well again. Same for my dad's car....ironically, both cars had a leaky front passenger side actuator.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

You can try a W124 manual, they will be similar to the W126.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

That's coincidence, not irony.