Volvo B10M Electrical Wiring And Circuit Diagrams

Like the chassis drawings I may not have the complete set of electrical manuals and wiring diagrams for my vehicle. I've referenced the Service Bulletins and Service Manuals I've sighted, obviously this list is incomplete with an unknown number of missing documents. Unfortunately the earliest factory Volvo B10M electrical wiring diagram that appears to be available through Elanders Sverige AB is dated 1992.

Electrical system information is presented by Volvo in different ways

  1. 'Wiring Diagrams' present the whole electrical system in one complex drawing. These diagrams were released via Service Bulletins and some Operator Manuals.
  2. 'Component Wiring Diagrams, Schematic Layouts' divide the electrical system into individual sections of common purpose (e.g. 'Brake Lights' schematic layout covers every component and connection from the brake switches through relays to the body builder's connection for the stop lights at the rear of the bus. These diagrams were released in the Electrical (Section 3, Group 37) Service Manuals.
  3. Minor B10M series modifications and changes that impacted on the electrical system could be released in Service Bulletins.
  4. Other electrical service and technical information was released in various Service Manuals.

From B10M Mk I initial production.
TP 15093/1 Service Manual Section 3 (36-38) Electrical System B10M.
Service Bulletin 3-37-16 Wiring Diagram B10M. Drawing 1137566 P01.
From B10M Mk I Chassis No. 503.
TP 15038/1 Service Manual Section 3(37) Electrical System B10M Component Wiring Diagrams.
Service Bulletin 3-37-18 Wiring Diagram B10M From Chassis No. 503. Drawing 1190343 P01. Note: this diagram does not incorporate Service Bulletin 3-38-08.
From B10M Mk I Chassis No. 4,854.
Service Manual Section(37) Electrical System, B10M (with effect from chassis No. 4854) Wiring Diagrams (schematic layout).
Service Bulletin 3-37-24 Wiring Diagram 1193990 P01.
From B10M Mk I Chassis No. 8,030.
Service Bulletin 3-37-26 Wiring Diagram 1193990 P02.
I couldn't find a matching Service Manual with Component Wiring Diagrams (Schematic Drawings) that is with effect from Chassis No. 8,030.
At first glance the only difference between the earlier 1193990 P01 and later P02 wiring diagrams is the addition of component 9004 'Off-load electronic for sender, electrical centre (A12)' which was introduced on Service Bulletin 3-38-8, but connectors around the electrical centre have changed from labels like 32"A"1 to 8"A"1 codes and I don't know what other changes have been incorporated.
From B10M Mk II Chassis No. 11,644.
TP 15192/1 Service Manual Section 3(37) Electrical System B10M (from ch. No. 11644) Component Wiring Diagrams.
From B10M Mk II Chassis No. 13,883.
TP 15238/1 Service Manual Section 3(37) Electrical System B10M Component Wiring Diagrams.
From B10M Mk III Chassis No. 20001.
TP 15356/1 Service Manual Section 3(37) Electrical System B10M Component Wiring Diagrams.
From B10M Mk III Chassis No. 25184.
TP 15457/1 Service Manual Section 3(37) Electrical System B10M Component Wiring Diagrams.
From B10M Mk III Chassis No. 29008.
TP 15528/1 Service Manual Section 3(37) Electrical System B10M Component Wiring Diagrams.

Warning: The size of these drawing ranges from ~3.6M to ~10.3M Bytes and will be slow to download. As the drawings were stitched together from different pieces there are multiple discontinuities. Refer to the Service Bulletin associated with a drawing to decipher/decode the component numbers. The corresponding Component Wiring Diagrams (Schematic Circuits) are much easier to interpret and determine the operation of an electrical circuit e.g. brake lights.

Picture
Wiring diagram 1137566 P01 for B10M Mk I from start of production to Chassis No. 502. Reference is Service Bulletin 3-37-16

Picture
Wiring diagram 1190343 P01 for B10M Mk I from Chassis No. 503 to 4853.Reference is Service Bulletin 3-37-18

Picture
Wiring diagram 1137566 P01 for B10M Mk I from Chassis No. 4854 to 8029. Reference is Service Bulletin 3-37-24

Picture
Wiring diagram 1193990 P02 for B10M Mk I from Chassis No. 8030. Reference is Service Bulletin 3-37-26
Picture
Wiring diagram 1193991 P02 for B10M Mk I Articulated from Chassis No. 8030. Reference is Service Bulletin 3-37-26