Lighting System (Diagnostic Codes & Circuit Tests): Overview Toyota Corolla XI

DESCRIPTION

The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.

Scheme 67

The combination meter assembly receives the turn signal switch information and controls the turn signal lights.

Scheme 68

The main body ECU (multiplex network body ECU) receives the following switch information

1. Light control switch in off (DRL OFF), tail, head or AUTO (DRL) position
2. Dimmer switch in high, low or high flash (pass) position
3. Fog light switch in front or off position

Scheme 69

The main body ECU (multiplex network body ECU) controls the daytime running lights.

Scheme 70

The main body ECU (multiplex network body ECU) controls the front fog lights.

Scheme 71

The combination meter assembly receives the hazard warning signal switch assembly ON signal and controls the operation of the hazard warning lights.

Scheme 72

Scheme 73

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Body Electrical / Combination Meter / Data List. Read the display on the Techstream. Body Electrical > Combination Meter > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Hazard Flasher Switch Hazard warning signal switch signal ON or OFF ON: Hazard warning signal switch on OFF: Hazard warning signal switch off - Body Electrical > Combination Meter > Data List Tester Display Hazard Flasher Switch OK Normal conditions listed above are displayed. Result Proceed to OK NG Result: 1 OK PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [08/2013 - ]»(ref-635445-S33172269652014070300000) Result: 2 NG See step 2
2. INSPECT HAZARD WARNING SIGNAL SWITCH ASSEMBLY Remove the hazard warning signal switch assembly. Refer to «REMOVAL [08/2013 - ]»(ref-635610-S23425719622014070300000) Measure the resistance according to the value(s) in the table below. *a Component without harness connected (Hazard Warning Signal Switch Assembly) Standard Resistance Tester Connection Condition Specified Condition 4 (TB) - 1 (E) Hazard warning signal switch on Below 1 ohms Hazard warning signal switch off 10 kohms or higher Result Proceed to OK NG Result: 2 NG REPLACE HAZARD WARNING SIGNAL SWITCH ASSEMBLY. Refer to «REMOVAL [08/2013 - ]»(ref-635610-S23425719622014070300000) Result: 1 OK See step 3
3. CHECK HARNESS AND CONNECTOR (HAZARD WARNING SIGNAL SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY AND BODY GROUND) Disconnect the E47 combination meter assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E41-4 (TB) - E47-3 (HAZ) Always Below 1 ohms E41-4 (TB) - Body ground Always 10 kohms or higher E41-1 (E) - Body ground Always Below 1 ohms Result Proceed to OK NG Result: 1 OK REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL [08/2013 - ]»(ref-635614-S03437747442014070300000) Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR

The main body ECU (multiplex network body ECU) detects the condition of the parking brake switch assembly.

Scheme 74

Scheme 75

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. Body Electrical > Main Body > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Parking Brake SW Parking brake switch signal ON or OFF ON: Parking brake switch on OFF: Parking brake switch off - Body Electrical > Main Body > Data List Tester Display Parking Brake SW OK Normal conditions listed above are displayed. Result Proceed to OK NG Result: 1 OK PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [08/2013 - ]»(ref-635445-S33172269652014070300000) Result: 2 NG See step 2
2. INSPECT PARKING BRAKE SWITCH ASSEMBLY Remove the parking brake switch assembly. Refer to «REMOVAL [08/2013 - ]»(ref-635657-S32266357232014070300000) Inspect the parking brake switch assembly. Refer to «INSPECTION [08/2013 - ]»(ref-635657-S33789963882014070300000) Result Proceed to OK NG Result: 2 NG REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to «REMOVAL [08/2013 - ]»(ref-635657-S32266357232014070300000) Result: 1 OK See step 3
3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH ASSEMBLY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Disconnect the 3E driver side junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L17-1 - 3E-30 Always Below 1 ohms L17-1 - Body ground Always 10 kohms or higher Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR Result: 1 OK See step 4
4. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY Remove the driver side junction block assembly. Refer to «REMOVAL [08/2013 - ]»(/toyota/corolla/xi-2012-2016/remont/body-electrical/#power-distribution-service-information) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly. Measure the resistance according to the value(s) in the table below. *a Component without harness connected (Driver Side Junction Block Assembly) - - Standard Resistance Tester Connection Condition Specified Condition 3E-30 - MB-12 (PKB) Always Below 1 ohms 3E-30 - Body ground Always 10 kohms or higher Result Proceed to OK NG Result: 1 OK REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL [08/2013 - ]»(/toyota/corolla/xi-2012-2016/remont/body-electrical/#power-distribution-service-information) Result: 2 NG REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL [08/2013 - ]»(/toyota/corolla/xi-2012-2016/remont/body-electrical/#power-distribution-service-information)

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

Scheme 76

The main body ECU (multiplex network body ECU) controls the low beam headlights.

The main body ECU (multiplex network body ECU) controls the high beam headlights.

Scheme 77

See also:
• REMOVAL [08/2013 - ]