DESCRIPTIONThis procedure is for troubleshooting when the brake system warning light (red indicator) remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the brake system warning light (red indicator) in the combination meter assembly via CAN communication. WIRING DIAGRAMCAUTION / NOTICE / HINTNOTICE: Before performing this procedure, depress the brake pedal and confirm that the stop lights illuminate. PROCEDURE
(a) Check that all of the following conditions required for the brake system warning light (red indicator) to turn off are met: (1) The ABS warning light are not illuminated. HINT: If the ABS warning light remains illuminated, make sure that the conditions required for the ABS warning light to turn off are met. (2) The brake fluid level in the brake master cylinder reservoir assembly is not low. (3) Ensure that the brake booster has sufficient vacuum. HINT: When the vacuum inside the brake booster decreases, the brake system warning light (red indicator) comes on.
(a) Connect the GTS to the DLC3. (b) Turn the ignition switch to ON. (c) Enter the following menus: Chassis / Brake/EPB / Utility / Vehicle Control History (RoB). (d) Using the GTS, check for Vehicle Control History (RoB). Chassis > Brake/EPB > Utility
HINT: If vehicle control history (RoB) is stored when the electronically controlled brake system and electric parking brake system are suspended, the brake system warning light (red indicator) illuminates.
(b) Disconnect the A67 brake fluid level warning switch (brake master cylinder reservoir assembly) connector. (c) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (d) Measure the resistance according to the value(s) in the table below. HINT: A float is located inside the reservoir. Its position changes according to the brake fluid level. Standard Resistance:
(e) If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. (b) Disconnect the I4 combination meter assembly connector. (c) Disconnect the A67 brake fluid level warning switch (brake master cylinder reservoir assembly) connector. (d) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (e) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Inspect the vacuum warning switch assembly. OK: The vacuum warning switch assembly is normal.
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. (b) Disconnect the I4 combination meter assembly connector. (c) Disconnect the A65 vacuum warning switch assembly connector. (except Hatchback) (d) Disconnect the A163 vacuum warning switch assembly connector. (for Hatchback) (e) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (f) Measure the resistance according to the value(s) in the table below. Standard Resistance (except Hatchback):
Standard Resistance (for Hatchback):
(a) Connect the GTS to the DLC3. (b) Turn the ignition switch to ON. (c) Enter the following menus: Body Electrical / Combination Meter / Active Test. (d) Perform the Active Test of the combination meter assembly using the GTS. Body Electrical > Combination Meter > Active Test
(e) Check the combination meter assembly. OK: The brake system warning light (red indicator) turns on or off in accordance with GTS operation.
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. (b) Disconnect the I4 combination meter assembly connector. (c) Disconnect the A67 brake fluid level warning switch (brake master cylinder reservoir assembly) connector. (d) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (e) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Inspect the vacuum warning switch assembly. OK: The vacuum warning switch assembly is normal.
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. (b) Disconnect the I4 combination meter assembly connector. (c) Disconnect the A65 vacuum warning switch assembly connector. (except Hatchback) (d) Disconnect the A163 vacuum warning switch assembly connector. (for Hatchback) (e) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (f) Measure the resistance according to the value(s) in the table below. Standard Resistance (except Hatchback):
Standard Resistance (for Hatchback):
(a) Connect the GTS to the DLC3. (b) Turn the ignition switch to ON. (c) Enter the following menus: Body Electrical / Combination Meter / Active Test. (d) Perform the Active Test of the combination meter assembly using the GTS. Body Electrical > Combination Meter > Active Test
(e) Check the combination meter assembly. OK: The multi-information display turns on or off in accordance with GTS operation.
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