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STEP
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INSPECTION
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ACTION
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1
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INSPECT ABS/TCS HU/CM POWER SUPPLY FUSE
Is ABS/TCS HU/CM ignition power supply fuse okay?
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Yes
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Go to next step.
Check for a short to ground on blown fuse's circuit.
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No
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Repair or replace as necessary.
Install appropriate amperage fuse.
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2
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 (DATA LINK CONNECTOR-2) FOR CONTINUITY AND SHORTS
Perform DTC inspection.
Is error message displayed regarding communication between ABS/TCS HU/CM and WDS or equivalent?
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Yes
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If a communication error message is displayed even after inspecting according to procedure displayed on WDS or equivalent, go to step 8.
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No
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Go to next step.
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3
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CHECK FOR DTCS IN ABS/TCS HU/CM
Have DTCs been recorded in memory?
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Yes
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Perform inspection using appropriate DTC.
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No
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Go to next step.
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4
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INSPECT PID/DATA IN ABS/TCS HU/CM
Inspect the following items using WDS or equivalent PID/DATA monitor function.
• ABS_LAMP (ABS warning light)
• BRAKE_ LAMP (BRAKE system warning light)
• ABS_VOLT (power supply voltage)
Is ABS_LAMP and BRAKE_LAMP ON after more than 4 seconds with ignition switch on?
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Yes
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Go to Step 7.
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No
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Go to next step.
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5
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CHECK FOR OPEN CIRCUIT IN ABS/TCS HU/CM
Disconnect ABS/TCS HU/CM connector.
Connect the SST (49 G066 001) (vehicle harness side only).
Use the SST connector to ground the warning light terminal (ABS: terminal W, BRAKE system: terminal X) to body ground.
Do both ABS warning light and BRAKE system warning light go out with ignition switch on?
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Yes
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Replace ABS/TCS HU/CM (open circuit in ABS/TCS HU/CM)
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No
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Go to next step.
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6*
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VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN INSTRUMENT CLUSTER AND ABS/TCS HU/CM FOR CONTINUITY) OR INSTRUMENT CLUSTER
Disconnect instrument cluster connector
Is there continuity between following ABS/TCS HU/CM connector terminals and instrument cluster connector terminals?
• Terminal X and terminal 2F (16 pin)
• Terminal W and terminal 2F (24 pin)
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Yes
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Replace instrument cluster (open or short to ground in instrument cluster).
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No
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Repair wiring harness between ABS/TCS HU/CM (ABS: terminal W, BRAKE warning: terminal X) and instrument cluster
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7
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INSPECT ABS/TCS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL Z)
Check the voltage for PID/DATA monitor ABS_VOLT item.
Specification: about 10 V
Is voltage within specification?
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Yes
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Replace ABS/TCS HU/CM (open or short in ground circuit in ABS/TCS HU/CM)
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No
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Go to next step.
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8
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INSPECT BATTERY
Is battery voltage normal?
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Yes
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Go to next step.
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No
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Inspect battery and charging system.
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9
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INSPECT CHARGING SYSTEM
Is battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling?
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Yes
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Go to Step 7.
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No
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Inspect charging system (drive belt tension, generator, etc.).
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10
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VERIFY THAT ABS/TCS HU/CM CONNECTOR IS CONNECTED WITH ABS/TCS HU/CM
Is ABS/TCS HU/CM connector securely connected?
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Yes
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Go to Step 12.
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No
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Connect ABS/TCS HU/CM connector securely, then go to next step.
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11
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS/TCS HU/CM IS CONNECTED
Do both ABS warning light and BRAKE system warning light go out after more than 4 seconds with ignition switch on?
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Yes
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Temporary poor connection in ABS/TCS HU/CM
Inspect connector and terminal.
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No
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Go to next step.
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12
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VERIFY THAT ABS/TCS HU/CM CONNECTOR TERMINAL Z AND AA ARE CONNECTED
Does malfunction symptom happen again when ABS/TCS HU/CM connector terminal Z and AA are shaken while the ignition switch ON?
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Yes
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Connect ABS/TCS HU/CM connector terminal Z and AA securely, then go to next step.
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No
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Go to next step.
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13
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS/TCS HU/CM CONNECTOR TERMINALs Z AND AA ARE CONNECTED
Do both ABS warning light and BRAKE system warning light go out after more than 4 seconds with ignition switch on?
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Yes
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Temporary poor connection in ABS/TCS HU/CM
Inspect connector and terminal.
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No
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Go to next step.
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14
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM POWER SUPPLY AND ABS/TCS HU/CM FOR CONTINUITY
Disconnect ABS/TCS HU/CM connector.
Connect the SST (49 G066 001) (vehicle harness side only).
Is voltage approximately 12 V at SST connector terminal Z?
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Yes
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Go to next step.
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No
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Repair wiring harness between fuse block and ABS/TCS HU/CM
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15
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM GROUND FOR CONTINUITY
Turn ignition switch to LOCK.
Is there continuity between SST connector terminal AA and ground?
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Yes
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If a malfunction error message is displayed on WDS or equivalent in Step 1 inspection, go to next step.
If a malfunction error message is not displayed on WDS or equivalent in Step 1 inspection, troubleshooting is completed.
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No
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Repair wiring harness between ABS/TCS HU/CM and ground.
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16
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 (DATA LINK CONNECTOR-2) FOR CONTINUITY
Is there continuity between SST connector terminal AA and DLC-2?
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Yes
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Go to next step.
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No
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Repair wiring harness between ABS/TCS HU/CM and DLC-2.
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17
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 (DATA LINK CONNECTOR-2) FOR SHORT TO BATTERY
Is voltage approximately 12 V at SST connector terminal T?
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Yes
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Repair wiring harness between ABS/TCS HU/CM and DLC-2.
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No
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Go to next step.
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18
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 (DATA LINK CONNECTOR-2) FOR SHORT TO GROUND
Is there continuity between SST connector Terminal T and DLC-2?
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Yes
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Repair wiring harness between ABS/TCS HU/CM and DLC-2.
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No
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Replace ABS/TCS HU/CM (communication circuit malfunction in ABS/TCS HU/CM)
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