Problem Symptoms Table
WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
Proceed to troubleshooting of each circuit in the table below.
- HEADLIGHT AND TAILLIGHT SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information Only one headlight comes on. Bulb - HEAD (HI LH, HI RH, LO LH, LO RH) fuse - Harness or connector - Headlight does not come on. HEAD (HI LH, HI RH, LO LH, LO RH) fuse - Headlight relay circuit HEADLIGHT RELAY CIRCUIT Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Headlight dimmer switch circuit LIGHT CONTROL SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - "HI.-Beam" does not come on (All). (w/o D.R.L. system) Headlight dimmer switch REMOVAL Harness or connector - "HI-Beam" does not come on (All). HEAD (HI LH, HI RH) fuse - Headlight dimmer switch circuit LIGHT CONTROL SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - "HI-Beam" does not come on (One side). Bulb - HEAD (HI LH, HI RH) fuse - Harness or connector - "Flash" does not come on. Headlight Dimmer Switch REMOVAL Harness or connector - Headlight is dark. Bulb - Harness or connector - Only one tail light comes on. Bulb - Harness or connector - Tail light does not come on. TAIL fuse - Bulb - TAIL relay circuit TAILLIGHT RELAY CIRCUIT Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Headlight dimmer switch circuit LIGHT CONTROL SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Daytime running light system does not operate. DRL relay circuit DRL RELAY CIRCUIT Headlight dimmer switch circuit LIGHT CONTROL SWITCH CIRCUIT Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT Generator signal circuit GENERATOR SIGNAL CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Parking brake switch circuit PARKING BRAKE SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - - LIGHT AUTO TURN OFF SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information Light auto turn off system does not operate. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Headlight dimmer switch circuit LIGHT CONTROL SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - - FOG LIGHT SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information Front fog light does not come on with light control switch HEAD position. FR FOG Fuse - FOG LIGHT relay FOG LIGHT RELAY Headlight dimmer switch (Fog light switch) REMOVAL Harness or connector - Only one front fog light does not come on. Bulb - Harness or connector - - TURN SIGNAL AND HAZARD WARNING SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information "Hazard" and "Turn" do not come on. TRN-HAZ fuse - IG1 fuse - Ignition switch - Turn signal flasher TURN SIGNAL FLASHER ASSEMBLY Harness or connector - Hazard warning light does not come on. (Turn is normal) Hazard warning switch HAZARD WARNING SWITCH Harness or connector - Turn signal does not come on. (Hazard is normal) Headlight dimmer switch (Turn signal switch) REMOVAL Harness or connector - Turn signal does not come on in one direction. Headlight dimmer switch (Turn signal switch) REMOVAL Turn signal flasher TURN SIGNAL FLASHER ASSEMBLY Harness or connector - Only one bulb does not come on. Bulb - Harness or connector - - STOP LIGHT SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information Stop light does not come on. STOP fuse - Bulb - Stop light switch STOP LIGHT SWITCH DAC relay - Turn signal flasher - Harness or connector - Skid control ECU - - BUCK UP LIGHT SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information Back up light does not come on. IG1 fuse - ACC fuse - Bulb - BK/UP relay BACK-UP LIGHT RELAY Park/neutral position switch REMOVAL Harness or connector - - ILLUMINATED ENTRY SYSTEM PROBLEM SYMPTOMS TABLE
Symptom Suspected Area Information Illumination light of Multiplex body ECU control does not come on. (Terminal ILE of instrument panel J/B) Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Interior light circuit INTERIOR LIGHT CIRCUIT Illumination circuit ILLUMINATION CIRCUIT Door lock position circuit DOOR LOCK POSITION CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Illumination light of Multiplex body ECU control does not go off. (Terminal ILE of instrument panel J/B) Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Interior light circuit INTERIOR LIGHT CIRCUIT Illumination circuit ILLUMINATION CIRCUIT Door lock position circuit DOOR LOCK POSITION CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Illumination light of Multiplex body ECU No. 2 control does not come on (center console spot light, foot light, inside door handle illumination). Illumination circuit (body ECU No. 2 control) ILLUMINATION CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Door lock position circuit DOOR LOCK POSITION CIRCUIT Multiplex network body ECU No. 2 - Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Illumination light of Multiplex body ECU control does not go off (center console spot light, foot light, inside door handle illumination). Illumination circuit (body ECU No. 2 control) ILLUMINATION CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Door lock position circuit DOOR LOCK POSITION CIRCUIT Multiplex network body ECU No. 2 - Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Courtesy light does not come on. Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Courtesy light does not go off. Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Step light does not come on. Bulb - Illumination circuit (body ECU No. 2 control) ILLUMINATION CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Door courtesy light and courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT Door lock position circuit DOOR LOCK POSITION CIRCUIT Multiplex network body ECU No. 2 - Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) - Auto dimmer function does not operate. Auto dimmer signal circuit DIMMER SIGNAL CIRCUIT Ignition switch circuit IGNITION SWITCH CIRCUIT Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT Instrument panel J/B assembly (Driver side J/B assembly (Multiplex network body ECU)) -