Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Honda Insight BaseFACTORY OEM SERVICE PROCEDURE
Connector to Fuse/Relay Box Index
Battery Terminal Fuse Box
BATTERY TERMINAL FUSE BOX
| Socket | Ref | Terminal | Connects to |
|---|---|---|---|
| T-1 | 1 | -- | Battery terminal. Starter (see CONNECTOR TO HARNESS INDEX ) |
| T-2 | 2 | -- | DC-DC converter cable (included in the IMA motor power cable) (see Table 23 on CONNECTOR TO HARNESS INDEX ) |
| T-3 | 3 | -- | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| T-4 | 4 | -- | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| T-5 | 5 | -- | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
Under-Dash Fuse/Relay Box
UNDER-DASH FUSE/RELAY BOX
| Socket | Ref | Terminals | Connects to |
|---|---|---|---|
| A | 10 | 36 | Right engine compartment wire harness (see Table 10 on CONNECTOR TO HARNESS INDEX ) |
| A/F sensor relay | 3 | 4 | |
| B | 11 | 36 | Left engine compartment wire harness (see Table 13 on CONNECTOR TO HARNESS INDEX ) |
| Blower motor relay | 2 | 4 | |
| C | 12 | 49 | Driver's side wire harness (see Table 22 on CONNECTOR TO HARNESS INDEX ) |
| Driver's door unlock relay | 19 | 5 | |
| E | 17 | 12 | Driver's door wire harness (see Table 34 on CONNECTOR TO HARNESS INDEX ) |
| Electronic throttle control system (ETCS) control relay | 7 | 4 | |
| F | 16 | 6 | Driver's door wire harness (see Table 34 on CONNECTOR TO HARNESS INDEX ) |
| G | 15 | 8 | Roof wire harness (see Table 28 on CONNECTOR TO HARNESS INDEX ) |
| H (optional connector) | 14 | 8 | Not used |
| Ignition coil relay | 5 | 4 | |
| J (MICU service check connector) | 13 | 3 | |
| K | 20 | 10 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| Lighting relay | 4 | 4 | |
| M | 21 | 34 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| N | 22 | 8 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| P (SRS) | 30 | 4 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| PGM-FI main relay 1 | 6 | 4 | |
| Power window relay | 1 | 4 | |
| Q | 29 | 16 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| R | 28 | -- | Not used |
| Rear window defogger relay | 8 | 4 | |
| S | 24 | 3 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| Starter cut relay | 9 | 4 | |
| T | 25 | 2 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| W | 23 | 1 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| X | 27 | 3 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| Y (Electrical load detector) | 26 | 3 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
| T-9 | 18 | -- | Left engine compartment wire harness (see Table 13 on CONNECTOR TO HARNESS INDEX ) |
Auxiliary Under-Hood Fuse/Relay Box
AUXILIARY UNDER-HOOD FUSE/RELAY BOX
| Socket | Ref | Terminals | Connects to |
|---|---|---|---|
| Fan control relay | 1 | 5 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| PGM-FI main relay 2 | 2 | 4 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
Auxiliary Under-Hood Relay Box
AUXILIARY UNDER-HOOD RELAY BOX
| Socket | Ref | Terminals | Connects to |
|---|---|---|---|
| A/C condenser fan relay | 3 | 4 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| Radiator fan relay | 4 | 4 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| A/C compressor clutch relay | 5 | 4 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| A/C diode A | 6 | 2 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
| A/C diode B | 7 | 2 | Left engine compartment wire harness (see Table 11 on CONNECTOR TO HARNESS INDEX ) |
Under-Dash Relay Holder
UNDER-DASH RELAY HOLDER
| Socket | Ref | Terminal | Connects to |
|---|---|---|---|
| Hatch release actuator relay | 1 | 5 | Dashboard wire harness (see Table 14 on CONNECTOR TO HARNESS INDEX ) |
IPU Relay Holder
IPU RELAY HOLDER
| Socket | Ref | Terminal | Connects to |
|---|---|---|---|
| Motor control module (MCM) relay 1 | 1 | 4 | IPU wire harness (see Table 24 on CONNECTOR TO HARNESS INDEX ) |
| Motor control module (MCM) relay 2 | 2 | 4 | IPU wire harness (see Table 24 on CONNECTOR TO HARNESS INDEX ) |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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