From factory, this EJ EH rear body harness was configured so that a rear compartment light such as a boot light option could be added without any physical cutting of the wiring loom.
Figure 1.1 show the black wire is looped from cavity 3 into cavity 4. This is how the body harness is configured if no rear boot light is added to the vehicle.
Fig 1.1 – Body Harness configured without rear compartment light
Figure 1.2 shows the black loop wire is terminated into a single way connector. This single connector is then plugged into the boot light harness. The boot light harness (sold separately) has a spare black wire which is then looped back into cavity 4 of the main body loom plug as shown.
Fig 1.2 – Body Harness configured with rear compartment light