Pre-Collision System (Diagnostics - Introduction): Diagnosis Lexus IS III

PROBLEM SYMPTOMS TABLE [04/2013 - ]

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Scheme 27

Scheme 28

Scheme 29

1. CHECK DRIVING SUPPORT ECU ASSEMBLY Disconnect the M1 driving support ECU assembly connector. NOTE: Do not apply excessive force to the connector. If a force of 10 kg or more is applied, the connector may break. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition M1-5 (PBSW) - Body ground V - Body ground Pre-collision system cancel switch assembly signal Pre-collision system cancel switch assembly on Below 1 ohms Pre-collision system cancel switch assembly off 10 kohms or higher M1-25 (GND) - Body ground BR - Body ground Ground Always Below 1 ohms M1-30 (B) - Body ground B - Body ground Power source Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V HINT: If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the M1 driving support ECU assembly connector. Check for pulses according to the value(s) in the table below. Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition M1-17 (CA2L) - M1-25 (GND) B - BR CAN communication signal Engine switch on (IG) Pulse generation (See waveform 1) M1-18 (CA1N) - M1-25 (GND) G - BR CAN communication signal Engine switch on (IG) Pulse generation (See waveform 2) M1-39 (CA2H) - M1-25 (GND) G - BR CAN communication signal Engine switch on (IG) Pulse generation (See waveform 3) M1-40 (CA1P) - M1-25 (GND) B - BR CAN communication signal Engine switch on (IG) Pulse generation (See waveform 4) Waveform 1 CAN communication signal Item Content Tester Connection M1-17 (CA2L) - M1-25 (GND) Tool Setting 1 V/DIV., 10 μsec./DIV. Condition Engine switch on (IG) HINT: The waveform varies depending on the CAN communication signal. Waveform 2 CAN communication signal Item Content Tester Connection M1-18 (CA1N) - M1-25 (GND) Tool Setting 1 V/DIV., 10 μsec./DIV. Condition Engine switch on (IG) Waveform 3 CAN communication signal Item Content Tester Connection M1-39 (CA2H) - M1-25 (GND) Tool Setting 1 V/DIV., 10 μsec./DIV. Condition Engine switch on (IG) HINT: The waveform varies depending on the CAN communication signal. Waveform 4 CAN communication signal Item Content Tester Connection M1-40 (CA1P) - M1-25 (GND) Tool Setting 1 V/DIV., 10 μsec./DIV. Condition Engine switch on (IG)

DIAGNOSIS SYSTEM [04/2013 - ]

1. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION [04/2013 - ]»(ref-665529-S26412111322014102400000)
2. FUNCTION OF WARNING INDICATOR AND MESSAGE If the pre-collision system is not functioning properly, the driver is warned by the PCS warning indicator and a warning message on the multi-information display in the combination meter assembly. Master Warning Indicator Warning Message Detail DTC PCS Warning Indicator ON Check PCS System This message is displayed when the driving support ECU assembly detects a system malfunction o Flashes OFF PCS temporarily not available This message is displayed when the driving support ECU assembly is in fail-safe mode Refer to «FAIL-SAFE CHART [04/2013 - ]»(ref-665869-S25820538962014102400000) - Flashes Initial check The initial check occurs when the engine switch is off for more than 2 seconds, and then turned on (IG). The initial check consists of a pre-collision system diagnostic check with a duration of approximately 3 seconds. If a malfunction is detected during the initial check, the multi-information display will display "Check PCS System " or "PCS temporarily not available". Constant check The driving support ECU assembly constantly monitors the pre-collision system for malfunctions after the engine switch is turned on (IG) and the initial check (approximately 3 seconds) has completed. "Check PCS System" or "PCS temporarily not available" is displayed on the multi-information display in the combination meter assembly when the constant check detects malfunctions in the pre-collision system.

DTC CHECK/CLEAR [04/2013 - ]

1. CHECK DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Check for DTCs. Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665869-S36698318262014102400000) Body Electrical > Pre-Collision 2 > Trouble Codes
2. CLEAR DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Body Electrical > Pre-Collision 2 > Clear DTCs

DATA LIST/ACTIVE TEST [04/2013 - ]

1. DATA LIST NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Pre-Collision 2 / Data List. Read the Data List according to the display on the Techstream. Body Electrical > Pre-Collision 2 > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Wiper Information Wiper operational status Unoperat, Oil off, Mist, Washer, Unknown, Intermi, Lo or Hi The respective operational status displayed - PCS OFF Switch Pre-collision system cancel switch assembly status ON or OFF ON: Pre-collision system cancel switch assembly on OFF: Pre-collision system cancel switch assembly off - Pre-Collision System Pre-collision system control Valid or Inval Valid: Pre-collision system control possible Inval: Pre-collision system control not possible - PCS Indicator "Check PCS System" display request signal ON or OFF ON: "Check PCS System" display requested OFF: "Check PCS System" display not requested - PCS Disabled Indicator "PCS temporarily not available" display request signal ON or OFF ON: "PCS temporarily not available" display requested OFF: "PCS temporarily not available" display not requested - Pre-Collision Safety Warning Buz Pre-collision system warning buzzer Valid or Inval Valid: Pre-collision system warning buzzer operation possible Inval: Pre-collision system warning buzzer operation not possible - Pre-Collision Brake Pre-collision brake function Valid or Inval Valid: Pre-collision brake operation possible Inval: Pre-collision brake operation not possible - PBA Start Pre-collision brake assist activation signal OFF, Standby, Assist Lv1 or Assist Lv2 OFF: Pre-collision brake assist not activated Standby: Pre-collision brake assist standby Assist Lv1: Pre-collision brake assist activated Assist Lv2: Pre-collision brake assist activated Signal status changes when the pre-collision brake assist is activated before a crash (Pre-collision brake will activate only in situations where the driver depresses the brake pedal) Brake Assist Standby Supplemental brake pressure signal ON or OFF ON: Supplemental brake pressure being provided OFF: Supplemental brake pressure not being provided Signal status changes when supplemental brake pressure is being provided after a crash is judged as unavoidable and before the brake pedal is depressed Pre-Collision Brake Control Pre-collision brake operational status ON or OFF ON: Pre-collision brake operating OFF: Pre-collision brake not operating Status changes when pre-collision brake operates before a crash AVS Start Adaptive variable suspension system control activation status ON or OFF ON: Adaptive variable suspension system control activated OFF: Adaptive variable suspension system control not activated w/ Adaptive Variable Suspension System Status changes when the suspension is controlled (stiffened) prior to a crash CCS Cancel Automatic cancellation of cruise control during pre-collision brake activation ON or OFF ON: Cruise control automatically canceled OFF: Cruise control not automatically canceled - Pre-Collision Safety Brake Ind Pre-collision system "BRAKE!" alert status ON or OFF ON: Pre-collision system "BRAKE!" alert on OFF: Pre-collision system "BRAKE!" alert off - Front Radar-Dirt History Millimeter wave radar sensor assembly dirt history ON or OFF ON: History of excessive dirt OFF: No history of excessive dirt - Front Radar-Environment Hist Millimeter wave radar sensor assembly environment condition history Good or Bad Good: No history of excessive bad environment Bad: History of excessive bad environment - Curr Com PCS-WIL-R Driver seat active headrest ECU connection status with or without with: Driver seat active headrest ECU connected without: Driver seat active headrest ECU not connected Not Supported Curr Com PCS-WIL-L Front passenger seat active headrest ECU connection status with or without with: Front passenger seat active headrest ECU connected without: Front passenger seat active headrest ECU not connected Not Supported Curr Com Night View ECU Night view ECU connection status with or without with: Night view ECU connected without: Night view ECU not connected Not Supported Curr Com Front Camera Module Front camera module connection status with or without with: Front camera module connected without: Front camera module not connected Not Supported Country# (DSS) Destination country for driving support ECU assembly JPN, NA, EURO, AUS, SAFC, OTHER, TWN, CHINA, THAI, GCC or NOFIX Actual country code - The Number of DTCs Number of DTCs min: 0, max: 255 Number of DTCs will be displayed - Enter the following menus: Powertrain / Radar Cruise / Data List. Read the Data List according to the display on the Techstream. Powertrain > Radar Cruise > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Country# (F Radar Sens) Destination country for millimeter wave radar sensor assembly JPN, NA, EURO, AUS, SAFC, OTHER, TWN, CHINA, THAI, GCC or NOFIX Actual country code - Enter the following menus: Chassis / ABS/VSC/TRAC / Data List. Read the Data List according to the display on the Techstream. Chassis > ABS/VSC/TRAC > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Stop Light Relay Output Stop light control relay (STOP LP) output ON or OFF ON: Relay output on (Stop light on) OFF: Relay output off (Stop light off)
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Pre-Collision 2 / Active Test. Perform Active Test according to the display on the Techstream. HINT: The engine switch must be turned on (IG) to proceed with the Active Test using the Techstream. Body Electrical > Pre-Collision 2 > Active Test Tester Display Measurement Item Control Range Diagnostic Note Radar Cruise Approach Alarm Buzzer Skid control buzzer assembly ON or OFF Buzzer can be heard PCS Crash Alarm Buzzer Skid control buzzer assembly ON or OFF Buzzer can be heard PCS Approach Alarm Buzzer Skid control buzzer assembly ON or OFF Buzzer can be heard Enter the following menus: Body Electrical / Combination Meter / Active Test. Perform Active Test according to the display on the Techstream. Body Electrical > Combination Meter > Active Test Tester Display Measurement Item Control Range Diagnostic Note Indicat. Precrash PCS warning indicator ON or OFF - Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test. Perform Active Test according to the display on the Techstream. Chassis > ABS/VSC/TRAC > Active Test Tester Display Measurement Item Control Range Diagnostic Note Stop Light Relay Stop light control relay (STOP LP) ON or OFF Stop lights come on

DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]

PRE-COLLISION SYSTEM