1) Check that the parking brake operates when the parking brake lever is engaged.
If the parking brake does not operate, check the parking brake system.
Refer to "4.Brakes 4C.Parking Brake System parking brake inspection".
2) Check for any interference from aftermarket electronic components such as two-way radios or lights.
Turn OFF or remove any aftermarket electronic components to ensure that there is no influence on inspections or operations.
1) Inspect the parking brake switch.
Refer to "4.Brakes 4C.Parking Brake System parking brake switch inspection".
If the installation position of the switch is improper, adjust it.
Replace if there are switch malfunctions.
Refer to "4.Brakes 4C.Parking Brake System parking brake switch removal".
Refer to "4.Brakes 4C.Parking Brake System parking brake switch installation".
2) Inspect the instrument panel cluster.
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster diagnostics".
If a malfunction is found in the instrument panel cluster, replace it.
Caution
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster removal".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster installation".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster setting".
1) Check that the ground point is normal.
Repair or clean any ground points that are improperly installed or significantly dirty.
2) Check that the harnesses and connectors are normal.
Inspect for the following circuits for an open circuit, short, poor connections at the connectors, and abnormal conditions such as worn or bent harnesses.
Caution
Refer to "201.General Information 14A.Service Information Guide Preliminary and post procedures".