Lighting System - Diagnostics: Diagnosis Toyota 4Runner IV

HOW TO PROCEED WITH TROUBLESHOOTING

1. Vehicle Brought To Work Shop
2. (See «CUSTOMER PROBLEM ANALYSIS CHECK»(ref-190086-S36394677202005091300000) )
3. Check Body Multiplex Communication System (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-190100-S32241736322005091300000) ) Check that the DTC outputs. DTC Outputs (Proceed To "Body Multiplex Communication System") DTC Does Not Output (Go To Step 4)
4. DTC Check (See «PRE-CHECK»(ref-190086-S08258490882005091300000) ) Malfunction Code (Go To Step 5) Normal Code (Go To Step 6 )
5. DTC Chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-190086-S38182815362005091300000) ) Go To Step 8
6. (See «PROBLEM SYMPTOMS TABLE»(ref-190086-S14273816442005091300000) )
7. Terminal Of ECU (See «TERMINALS OF ECU»(ref-190086-S20199658262005091300000) )
8. Circuit Inspection (See «DTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTION»(ref-190086-S34222325012005091300000) - «LIGHT AUTO TURN OFF SYSTEM LIGHT DOES NOT OPERATE»(ref-190086-S34222325012005091300000) )
9. Identification Of Problem
10. Repair Or Replace
11. Confirmation Test END

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DIAGNOSTIC TROUBLE CODE CHART

1. DTC Check If a malfunction code is displayed during the DTC check, check the suspected area listed for that code in the table below, and proceed to the appropriate page. DTC B1244 DTC No. Symptom Suspect Area B1244 Light Sensor Fail Light Sensor Wire Harness Driver Side Junction Block Assy

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1. Multiplex Network Body Computer
2. Multiplex Network Door ECU

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1. Headlamp And Tail Lamp
2. Automatic Light Control System AUTOMATIC LIGHT CONTROL SYSTEM PROBLEM SYMPTOMS Symptom Suspect Area Automatic light control system does not operate «AUTOMATIC LIGHT CONTROL SYSTEM DOES NOT OPERATE»(ref-190086-S26529457862005091300000)
3. Light Auto Cut System
4. Fog Lamp System
5. Turn Signal And Hazard Warning System
6. Illuminated Entry System

CIRCUIT DESCRIPTION

This DTC is output when failure in the light sensor circuit is detected.

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1. Check Light Check that the headlamp and the tail lamp comes on. NG : Flow Chart (Go To Flow Chart Of Headlight Or Taillight) OK : Go to Next Step
2. Read Value Of Hand-Held Tester Connect the hand-held tester to DLC3. Turn the ignition switch to ON and push the hand-held tester main SW ON. Select the item "AUTO LIGHT SW" in the DATA LIST, and read its value displayed on the hand-held tester. OK: Light control SW AUTO --> ON Light control SW except AUTO --> OFF NG : Go to step 5 OK : Go to Next Step
3. Check Automatic Light Control Sensor Measure voltage between terminals as shown in the chart below. Check the continuity between terminal 3 (CLTE) and body ground as shown in the chart below. Using an oscilloscope, check that signal waveform appears between terminals. Standard: AUTOMATIC LIGHT CONTROL SENSOR CONNECTOR TERMINALS SPECIFIED CONDITIONS Terminal No. (Symbol) Tester Connection Condition Specified Condition 1 (CLTB) 1 - 3 Constant 10 - 14 V 3 (CLTE) 3 - Body ground Constant Continuity 4 (CLTS) 4-3 IG SW ON Dimmer SW AUTO Signal waveform appears depending on outside brightness NG : Replace Automatic Light Control Sensor OK : Go to Next Step
4. Check Harness And Connector (Between Multiplex Network Body ECU And Automatic Light Control Sensor) Check that signal waveform appears between terminal B6-4 (CLTS) and B6-21 (CLTE) of the multiplex network body ECU. Standard: Bar appears Measure voltage between terminals B6-6 (CLTB) and B6-21 (CLTE) of the multiplex network body ECU. Standard: 10-14 V Check the continuity between terminal B6-21 (CLTE) of the multiplex network body ECU and body ground. Standard: There is continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Multiplex Network Body ECU
5. Check Harness And Connector (Between Headlamp Dimmer Switch Assy And Multiplex Network Body ECU) Check for open and short circuit in harness and connector (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Replace Headlamp Dimmer Switch Assy

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1. Check Light Check the condition A or B, when room lamp assy No. 1 does not light up. LIGHT CHECK Item Component A Door Lock ->Door Unlock B IG Switch ACC ->OFF B : Go to step 10 A : Go to Next Step
2. Check Door Lock Check which door lamp does not light up. DOOR LOCK CHECK Item Component A Driver Side Door B Passenger Side Door C Rear Door D Back Door B : Go to step 5 C : Go to step 7 D : Go to step 9 A : Go to Next Step
3. Check Front Door W/Motor Lock Assy LH Check the continuity between terminal 8 (LSSR) of front door w/motor lock assy LH and body ground. Standard: FRONT DOOR W/MOTOR CONNECTOR TERMINALS SPECIFIED CONDITIONS Door Lock Position Specified Condition Lock No continuity Unlock Continuity NG : Replace Front Door w/Motor Lock Assy LH OK : Go to Next Step
4. Check Harness And Connector (Between Multiplex Network Body ECU And Front Door w/Motor Lock Assy) Check the continuity between terminal 8 (LSSR) of the front door w/motor door lock assy LH and B4-21 (LSWD) of the multiplex network body ECU. Standard: There is continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Multiplex Network Body ECU
5. Check Front Door w/Motor Lock Assy RH Check the continuity between terminal 7 (LSSR) of the front door w/motor lock assy RH and body ground. Standard: FRONT DOOR W/MOTOR LOCK ASSY RH CHECK Door Lock Position Specified Condition Lock No Continuity Unlock Continuity NG : Replace Front Door w/Motor Lock Assy RH OK : Go to Next Step
6. Check Harness And Connector (Between Multiplex Network Body ECU And Front Door W/Motor Lock Assy) Check the continuity between terminal 7 (LSSR) of the front door w/motor door lock assy RH and B4-30 (LSWP) of the multiplex network body ECU. Standard: There is continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Multiplex Network Body ECU
7. Check Rear Door Lock Check which door lamp does not light up. Measure voltage between terminals when unlocking the door. Standard: NG : Replace Rear Door Lock OK : Go to Next Step
8. Check Harness And Connector (Between Driver Side Junction Block And Rear Door Lock) Check the continuity between terminals as shown in the chart below. Standard: REAR DOOR LOCK CHECK Malfunction Part Tester Connection Condition Rear Door LH 1L-16 (LSR) - Rear Door Lock LH Continuity Rear Door RH 1K-15 (LSR) - Rear Door Lock RH Continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Drive Side Junction Block
9. Check w/Motor Back Door Lock Assy Measure voltage between terminals 4 (LS3) of w/motor back door lock assy and body ground. Standard: TERMINALS CONTINUITY CHECK Door Lock Position Specified Condition Lock No Continuity Unlock Continuity NG : Replace w/Motor Back Door Lock Assy OK : Repair Or Replace Harness Or Connector
10. Check Drive Side Junction Block Measure voltage between terminal 1D-5 (ACC) of the driver side junction block and body ground. Standard: DRIVE SIDE JUNCTION BLOCK CHECK IG SW Specified Condition ACC 10-14 V OFF Below 1 V OK : Go to step 12 NG : Go to Next Step
11. Check Harness And Connector (Between Driver Side Junction Block And Ignition Switch Assy) Check the continuity between terminal 1D-5 (ACC) of the driver side junction block and the ignition switch assy. Standard: NG : Repair Or Replace Harness Or Connector OK : Replace Ignition Or Starter Switch Assy
12. Check Drive Side Junction Block (ILE) Measure voltage between terminals as shown in the chart below when turning the ignition switch to OFF. Standard: NG : Check And Replace Drive Side Junction Block OK : Go to Next Step
13. Check Harness And Connector (Between Driver Side Junction Block And Lamp) Disconnect the connector of the driver side junction block. Check the continuity between terminals as shown in the chart below. Standard: Item Specified Conditions Item Tester Connection Specified Condition Transponder Key Amplifier 1K-9 (ILE) - Transponder Key Amplifier Continuity Room Lamp Assy No.1, No. 2 1A-8 (ILR) - Room Lamp Assy Continuity NG : Repair Or Replace Harness Or Connector OK : Go to Next Step
14. Check Transponder Key Amplifier (Ignition Key Cylinder Light) Check the continuity between terminals of transponder key amplifier (ignition key cylinder light). Standard: There is continuity. NG : Replace Transponder Key Amplifier OK : Go to Next Step
15. Check Room Lamp Assy No. 1 Check the continuity between terminals of the room lamp assy No. 1. Standard: There is continuity. NG : Replace Room Lamp Assy No. 1 OK : Replace Room Lamp Assy No. 2

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INSPECTION PROCEDURE

1. Check Multiplex Network Body ECU Measure voltage between terminals when opening the front door LH only. Standard: MULTIPLEX NETWORK BODY ECU CHECK Front Door LH Tester Connection Specified Condition Close B5-23 (DCTY) - Body Ground 10-14 V Open B5-23 (DCTY) - Body Ground Below 1 V OK : Check And Replace Multiplex Network Body ECU NG : Go to Next Step
2. Inspect Courtesy Lamp Switch (Driver Side Door) Inspect the front door courtesy lamp switch continuity. Check that there is a continuity between terminal 1 and body ground when operating the switch. Standard: ON (When shaft is pressed): No continuity OFF (When shaft is not pressed): Continuity NG : Replace Courtesy Lamp Switch (Driver Side Door) OK : Go to Next Step
3. Check Harness And Connector (Between Multiplex Network Body ECU And Front Door Courtesy Lamp Switch LH) Disconnect the connector of the multiplex network body ECU. Check the continuity between terminal B5-23 (DCTY) and the front door courtesy lamp switch. Standard: There is continuity. NG : Repair Or Replace Harness Or Connector OK : Go to Next Step
4. Check Multiplex Network Body ECU Measure voltage between terminals when opening the front door RH only. Standard: FRONT DOOR RH CHECK (MULTIPLEX NETWORK BODY ECU) Front Door RH Tester Connection Specified Condition Close B5-24 (PCTY) - Body Ground 10 - 14 V Open B5-24 (PCTY) - Body Ground Below 1 V OK : Check And Replace Multiplex Network Body ECU NG : Go to Next Step
5. Inspect Courtesy Lamp Switch (Passenger Side Door) Inspect front door courtesy lamp switch continuity. Check that the continuity exists between terminal 1 and body ground when switch operating the switch. Standard: ON (When shaft is pressed): No continuity OFF (When shaft is not pressed): Continuity NG : Replace Courtesy Lamp Switch (Passenger Side Door) OK : Go to Next Step
6. Check Harness And Connector (Between Multiplex Network Body ECU And Front Door Couretesy Lamp Switch RH) Disconnect the connector of the multiplex network body ECU. Check the continuity between terminal B5-24 (PCTY) and the front door courtesy lamp switch. Standard: There is continuity. NG : Repair Or Replace Harness Or Connector OK : Go to Next Step
7. Check Multiplex Network Body ECU Measure voltage between terminals when opening the rear door LH only. Standard: REAR DOOR LH CHECK (MULTIPLEX NETWORK BODY ECU) Rear door LH Tester Connection Specified Condition Close B5-11 (RLCY) - Body Ground 10 - 14 V Open B5-11 (RLCY) - Body Ground Below 1 V OK : Check And Replace Multiplex Network Body ECU NG : Go to Next Step
8. Inspect Courtesy Lamp Switch (Rear Door RH) Inspect rear door courtesy lamp switch RH continuity. Check that the continuity exists between terminal 1 and body ground when operating the switch. Standard: ON (When shaft is pressed): No continuity OFF (When shaft is not pressed): Continuity NG : Replace Courtesy Lamp Switch (Rear Door RH) OK : Go to Next Step
9. Check Harness And Connector (Between Multiplex Network Body ECU And Rear Door Courtesy Lamp Switch LH) Disconnect the connector of the multiplex network body ECU. Check the continuity between terminal B5-11 (RLCY) and the rear door courtesy lamp switch RH. Standard: There is continuity. NG : Repair Or Replace Harness Or Connector OK : Go to Next Step
10. Check Multiplex Network Body ECU Measure voltage between terminals when opening the rear door RH only. Standard: REAR DOOR RH CHECK (MULTIPLEX NETWORK BODY ECU) Rear Door RH Tester Connection Specified Condition Close B5-12 (RRCY) - Body Ground 10 - 14 V Open B5-12 (RRCY) - Body Ground Below 1 V OK : Check And Replace Multiplex Network Body ECU NG : Go to Next Step
11. Inspect Courtesy Lamp Switch (Rear Door LH) Inspect rear door courtesy lamp switch LH continuity. Check that the continuity exists between terminal 1 and body ground when operating the switch. Standard: ON (When shaft is pressed): No continuity OFF (When shaft is not pressed): Continuity NG : Replace Courtesy Lamp Switch OK : Go to Next Step
12. Check Harness And Connector (Between Multiplex Network Body ECU And Rear Door Courtesy Lamp Switch RH) Disconnect the connector of the multiplex network body ECU. Check the continuity between terminal B5-12 (RRCY) and body ground. Standard: There is continuity. NG : Repair Or Replace Harness Or Connector OK : Go to Next Step
13. Inspect w/Motor Back Door Lock Assy Disconnect the connector of the w/motor back door lock assy. Check the continuity between terminal 3 (LSE) and 6 (LS2) of the w/motor back door lock assy. Standard: W/MOTOR BACK DOOR LOCK ASSY CHECK Back Door Tester Connection Specified Condition Close 3 (LSE) - 6 (LS2) No Continuity Open 3 (LSE) - 6 (LS2) Continuity NG : Replace w/Motor Back Door Lock Assy OK : Repair Or Replace Harness Or Connector

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1. Inspect Headlamp Relay Check the continuity of the headlamp relay. Standard: HEADLAMP RELAY CONNECTOR TERMINALS SPECIFIED CONDITION Condition Tester Connection Specified Condition Constant 1 - 2 Continuity Constant 3 - 5 No Continuity Apply B+ Between Terminal 1 And 2 3 - 5 Continuity NG : Replace Headlamp Relay OK : Go to Next Step
2. Inspect Headlamp Dimmer Switch Assy (Head) Inspect light control switch continuity. Check that there is a continuity between terminals at each switch position as shown in the chart. Standard: HEADLAMP DIMMER SWITCH CONNECTOR TERMINALS SPECIFIED CONDITIONS Switch Operation Tester Connection Specified Condition OFF - No Continuity HEAD 13-16-14 Continuity NG : Replace Headlamp Dimmer Switch Assy OK : Go to Next Step
3. Check Harness And Connector (Between Multiplex Network Body ECU And Headlamp Dimmer Switch Assy) Check the continuity terminal B6-1 (HEAD) of the multiplex network body ECU and the headlamp dimmer switch assy. Standard: There is continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Multiplex Network Body ECU

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1. Check Light Check the condition A, B or C, when tail lamp does not light up. TAIL LAMP CHECK Item Condition A All B Parking Lamp Only C Combination Lamp Only B : Go to step 5 C : Go to step 7 A : Go to Next Step
2. Inspect Tail Lamp Relay Inspect tail lamp relay continuity. Standard: TAIL LAMP RELAY CONNECTOR TERMINALS SPECIFIED CONDITIONS Condition Tester Connection Specified Condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ Between Terminal 1 And 2 3 - 5 Continuity NG : Replace Tail Lamp Relay OK : Go to Next Step
3. Inspect Headlamp Dimmer Switch Assy Inspect light control switch continuity. Check that there is continuity between terminals at each switch position as shown in the chart. Standard: HEADLAMP DIMMER SWITCH CONNECTOR TERMINALS SPECIFIED CONDITIONS Switch Operation Tester Connection Specified Condition OFF - No Continuity TAIL 14 - 16 Continuity NG : Replace Headlamp Dimmer Switch Assy OK : Go to Next Step
4. Check Harness And Connector (Between Multiplex Network Body ECU And Head Lamp Dimmer Switch Assy) Check the continuity between terminal B6-8 (TAIL) of the multiplex network body ECU and the headlamp dimmer switch assy. Standard: There is continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Multiplex Network Body ECU
5. Inspect LH Headlamp Assy (Parking Lamp) Check that there is a continuity between terminals of headlamp assy. Standard: ON: Continuity OFF: No continuity OK : Replace LH Headlamp Assy NG : Go to Next Step
6. Check Harness And Connector (Between Driver Side Junction Block And LH Headlamp Assy) Check the continuity between the terminal parking lamp assy and driver side junction block. Standard: ITEM SPECIFIED CONDITIONS Item Tester Connection Specified Condition Parking Lamp LH 1 - 1B-9 Continuity Parking lamp RH 1 - 1B-11 Continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Drive Side Junction Block
7. Inspect Rear Combination Lamp Assy LH Check that there is a continuity between terminals of rear combination lamp assy. Standard: ON: Continuity OFF: No continuity OK : Replace Rear Combination Lamp Assy LH NG : Go to Next Step
8. Check Harness And Connector (Between Driver Side Junction Block And Rear Combintion Lamp Assy) Check the continuity terminals 4 of the combination lamp and 1F-13 of the driver side junction block. Standard: There in continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Drive Side Junction Block

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1. Check Light Check that headlamp and taillight light up. NG : Flow Chart (Go To Flow Chart Of Headlight Or Taillight) OK : Go to Next Step
2. Inspect Headlamp Dimmer Switch Assy Inspect light control switch continuity. Check that there is a continuity between terminals at each switch position as shown in the chart. Standard: HEADLAMP DIMMER SWITCH CONNECTOR TERMINALS SPECIFIED CONDITIONS Switch Operation Tester Connection Specified Condition OFF - No continuity TAIL 14 - 16 Continuity HEAD 13 - 16 - 14 Continuity AUTO 16 - 12 Continuity NG : Replace Headlamp Dimmer Switch Assy OK : Go to Next Step
3. Check Automatic Light Control Sensor Measure voltage between terminals as shown in the chart below. Check the continuity between terminal 3 (CLTE) and body ground as shown in the chart below. Using an oscilloscope, check that signal waveform appears between terminals. Standard: AUTOMATIC LIGHT CONTROL SENSOR CONNECTOR TERMINALS SPECIFIED CONDITIONS Terminal No. (Symbol) Tester Connection Condition Specified Condition 1 (CLTB) 1 - 3 Constant 10 - 14 V 3 (CLTE) 3 - Body Ground Constant Continuity 4 (CLTS) 4 - 3 IG SW ON Dimmer SW AUTO Signal waveform appears depending on outside brightness NG : Replace Automatic Light Control Sensor OK : Go to Next Step
4. Check Harness And Connector (Between Multiplex Network Body ECU And Automatic Light Control Sensor) Check that signal waveform appears between terminal B6-4 (CLTS) and B6-21 (CLTE) of the multiplex network body ECU. Standard: Bar appears Measure voltage between terminals B6-6 (CLTB) and B6-21 (CLTE) of the multiplex network body ECU. Standard: 10-14 V Check the continuity between terminal B6-21 (CLTE) of the multiplex network body ECU and body ground. Standard: There is continuity NG : Repair Or Replace Harness Or Connector OK : Check And Replace Multiplex Network Body ECU

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1. Inspect Courtesy Lamp Switch (Driver Side Door) Inspect front door courtesy lamp switch continuity. Check that there is continuity between terminal 1 and body ground, when switch is operated. Standard: ON: (When Shaft Is Pressed): No Continuity OFF: (When Shaft Is Not Pressed): Continuity NG : Replace Courtesy Lamp Switch OK : Go to Next Step
2. Inspect Drive Side Junction Block (SIG) Insert the ignition key to the key cylinder. Measure the voltage between terminal 1C-2 of driver side junction block and body ground. Standard: DRIVE SIDE JUNCTION BLOCK(SIG) INSPECTION Ignition Key Specified Condition Insert 10 - 14 V Uninsert Below 1V NG : Repair Or Replace Harness Or Connector OK : Check And Replace Drive Side Junction Block