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Wiring Diagrams

Annotated wiring diagrams for the vehicles we see most often on Nigerian roads. Each entry covers the systems we've actually documented from real workshop work. With the gotchas, common failures, and connector locations a service manual will quietly omit.

15
Vehicles
324
Sheets
6
Documented
  • IntermediateDocumented

    Toyota Camry · 2007–2017

    2.4L / 2.5L petrol. XV40 & XV50 chassis

    The most-serviced Camry generation in Nigeria. Diagrams cover both the XV40 (2007–2011) and the XV50 (2012–2017) since they share most of the auxiliary harness layout.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Comfort & convenience
    • ABS / SRS

    Workshop notes

    • Power window master switch connector C12 corrodes after 8+ years. Diagram shows the alternative jumper point.
    • XV50 hybrid-style charging behaviour even on petrol-only models. Alternator output cycles between 13.6V and 14.8V intentionally.
    18 sheetsWorkshop reference
  • BasicDocumented

    Toyota Corolla · 2008–2018

    1.6L / 1.8L petrol. E140 & E170 chassis

    Covers both the E140 (2008–2013) and E170 (2014–2018) generations. The biggest delta is the body-control module , 2014+ moved most lighting logic into the BCM.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Body electronics
    • ABS / SRS

    Workshop notes

    • E170 cluster wakes up on door-open via the BCM. Diagram shows the wake signal pin.
    • Pre-2014 ignition switch IGN2 contact wears , 60% of "intermittent crank" complaints trace to this.
    14 sheetsWorkshop reference
  • IntermediateDocumented

    Toyota Hilux · 2005–2015

    2.5 / 3.0 D-4D diesel , 7th & 8th generation

    Workhorse diesel pickup. Covers the 2KD-FTV and 1KD-FTV diesel engine management as well as the body electronics.

    Systems covered

    • Starting
    • Charging
    • Engine management
    • Body electronics
    • ABS / SRS

    Workshop notes

    • Glow plug relay shares a fuse with the diesel pre-heat circuit. Diagram shows the failure mode where a single dead glow plug pulls the others down.
    • Crank position sensor circuit can be back-fed from the cam sensor. Measure both with engine cranking.
    16 sheetsWorkshop reference
  • AdvancedIn review

    Toyota Land Cruiser · 2008–2020

    200-series · 4.5L diesel & 4.6L petrol

    Comprehensive coverage for the 200-series including KDSS, AHC suspension, and the multi-bus CAN topology that's caught out many shops.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Comfort & convenience
    • Audio / infotainment
    • ABS / SRS

    Workshop notes

    • CAN gateway pinout matters. Diagnostic scanner often shows "no comms" on subsidiary modules when only the body CAN is broken.
    • KDSS hydraulic accumulator solenoid wiring is on a separate sheet. Easy to miss.
    28 sheetsWorkshop reference
  • IntermediateDocumented

    Honda Accord · 2008–2017

    2.4L i-VTEC , 8th & 9th generation

    Covers both generations. The 9th-gen (2013+) moved to CAN-bus for the cluster which broke a lot of aftermarket head units.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Body electronics
    • Audio / infotainment
    • ABS / SRS

    Workshop notes

    • 8th-gen ignition switch contact 2 fails by ~150,000 km. Symptom is "no start, no crank" intermittently.
    • 9th-gen head-unit replacement requires CAN-bus interface module; diagram shows the splice points.
    17 sheetsWorkshop reference
  • BasicDocumented

    Honda Civic · 2006–2015

    1.8L i-VTEC , 8th & 9th gen sedan

    Spans the FA/FD platforms. Solid baseline for typical Civic electrical work in Lagos and Abuja workshops.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Body electronics
    • ABS / SRS

    Workshop notes

    • Power window relay J5 unreliable past 100,000 km. Replacement with a standard automotive relay works.
    • Headlamp wiring shares ground with horn. If both fail together, suspect the ground point under the battery tray.
    13 sheetsWorkshop reference
  • IntermediateIn review

    Honda CR-V · 2007–2016

    2.4L petrol. RE & RM platforms

    Family SUV with extensive comfort wiring. Includes the AWD coupling solenoid circuit on the RM platform.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Comfort & convenience
    • ABS / SRS

    Workshop notes

    • AWD rear differential coupling solenoid: 3-pin connector under the rear floor pan, often cut by careless exhaust work.
    19 sheetsWorkshop reference
  • IntermediateDocumented

    Hyundai Elantra · 2011–2020

    1.6L / 1.8L / 2.0L. MD & AD chassis

    Best-selling Hyundai sedan in West Africa. CAN-bus architecture is heavy. Diagram includes the network topology overview.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Audio / infotainment
    • ABS / SRS

    Workshop notes

    • Smart key antenna #3 (boot lid) failure prevents the trunk-button unlock. Easy mis-diagnosis as a key fob issue.
    • BCM-managed lighting means a "blown bulb" warning may actually be a low-side driver in the BCM.
    22 sheetsWorkshop reference
  • IntermediateIn review

    Kia Sportage · 2010–2018

    2.0L / 2.4L petrol. SL & QL chassis

    Shares its electrical architecture closely with the Hyundai Tucson of the same era. Wiring notes carry across with minor pinout changes.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Body electronics
    • Comfort & convenience
    • ABS / SRS

    Workshop notes

    • Panoramic sunroof drain hoses unblock from the underside but the motor wiring runs through the same channel. Wet motor = drain not done.
    18 sheetsWorkshop reference
  • IntermediateIn review

    Nissan Altima · 2007–2018

    2.5L QR25DE. L32 & L33 chassis

    Common US-import sedan. CVT-equipped. Covers the JATCO RE0F10 transmission electrical interface.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • ABS / SRS

    Workshop notes

    • Push-start models: intelligent power distribution module (IPDM) handles a lot of relay logic that older Altimas had in discrete relays. Diagnose at the IPDM, not at "the relay".
    20 sheetsWorkshop reference
  • AdvancedIn review

    Lexus ES 350 · 2007–2018

    3.5L V6 2GR-FE. XV40 & XV60

    Closely related to the Camry of the same era but with extensive comfort electronics. Includes Mark Levinson audio harness.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Comfort & convenience
    • Audio / infotainment
    • ABS / SRS

    Workshop notes

    • Mark Levinson amplifier under the right rear seat. Usually the failure point for "audio cuts out intermittently".
    24 sheetsWorkshop reference
  • AdvancedIn review

    Mercedes-Benz C-Class · 2008–2014

    W204 chassis. C200 / C250 / C300

    W204 wiring covers the SAM (Signal Acquisition Module) front/rear, the EIS/EZS ignition module, and the SBC brake module on early facelift cars.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Comfort & convenience
    • ABS / SRS

    Workshop notes

    • EZS (ignition switch module) failure presents as "no comms with engine". Needs EZS replacement and re-coding to the chassis.
    • Rear SAM water-damage from blocked sunroof drains affects rear lights + trunk circuits.
    32 sheetsWorkshop reference
  • AdvancedIn review

    Mercedes-Benz E-Class · 2009–2016

    W212 chassis. E250 / E300 / E350

    Wiring covers the multi-bus CAN topology (CAN-B, CAN-C, CAN-D, MOST, LIN) that confuses most independent shops. Diagram includes the gateway pin map.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Comfort & convenience
    • Audio / infotainment
    • ABS / SRS

    Workshop notes

    • MOST optical ring failure on the head unit: a single bad fibre kills the entire infotainment chain. Test in sequence.
    36 sheetsWorkshop reference
  • AdvancedIn review

    BMW 3 Series · 2005–2013

    E90 / E91 / E92 , 320i / 325i / 330i

    The CAS module, FRM lighting module, and JBE junction box wiring all on one diagram. Most E90 lighting faults trace to the FRM.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Body electronics
    • Comfort & convenience
    • ABS / SRS

    Workshop notes

    • FRM brick after low-voltage reflash attempt: diagram shows the EEPROM read points for recovery on the bench.
    26 sheetsWorkshop reference
  • IntermediateField notes

    Ford Focus · 2008–2018

    1.6L / 2.0L petrol. Mk2.5 & Mk3

    Covers both the Mk2.5 facelift (2008–2010) and the Mk3 (2011–2018). PowerShift transmission electrical interface included for Mk3.

    Systems covered

    • Lighting
    • Starting
    • Charging
    • Engine management
    • Transmission
    • Body electronics
    • Audio / infotainment
    • ABS / SRS

    Workshop notes

    • PowerShift TCM connector pin 12. Clutch position sensor signal. Most "judder at takeoff" complaints are this connector, not the dry clutch packs.
    21 sheetsWorkshop reference
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