STEP 1. Voltage measurement at the gateway-ECU (for BSW) connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Measure the voltage between the gateway-ECU (for BSW) connector (+B terminal) and the body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 3. Go to Step 2.
STEP 2. Check of open circuit in +B line between the fusible link and gateway-ECU (for BSW) connector.
STEP 3. Voltage measurement at the gateway-ECU (for BSW) connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the gateway-ECU (for BSW) connector (IG terminal) and the body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 6. Go to Step 4.
STEP 4. Using scan tool (M.U.T.-IIISE), check other system data list.
Check the input signal from the ignition switch (IG1) in the ETACS-ECU.- Turn the ignition switch to the "ON" position.
| Item No. | Item name | Normal condition | 79 | IG voltage | Battery positive voltage |
|
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 5. : Troubleshoot the ETACS-ECU (Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received." ).
STEP 5. Check of open circuit in IG line between the ignition switch (IG1) and gateway-ECU (for BSW) connector.
STEP 6. Resistance measurement at the gateway-ECU (for BSW) connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the gateway-ECU (for BSW) connector (GND terminal) and the body ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 8. Go to Step 7.
STEP 7. Check of open circuit in GND line between gateway-ECU (for BSW) connector and body ground.
STEP 8. Retest the system