Toyota Corolla Cross: System Description
SYSTEM DESCRIPTION
HEATED STEERING WHEEL SYSTEM
(a) The steering heater warms up the steering wheel when the steering heater switch is turned on.
(b) The steering heater uses a control thermostat inside the steering wheel to maintain the steering wheel at the specified temperature.
OPERATION DESCRIPTION
(a) When the steering heater switch is turned on with the ignition switch ON, the heater indicator light illuminates and the heater inside the steering wheel operates. If the steering heater switch is pushed again, the heater indicator light turns off and the heater stops operating.
(b) A control thermostat and an additional thermostat used as a safety device to prevent overheating are installed inside the steering wheel.
CONTROL DESCRIPTION
(a) When the steering heater switch is turned on, current flows to the LO and HI sides, starting the warming operation to warm the steering wheel.
(b) When the temperature of the steering wheel reaches the operation temperature of the control thermostat, the control thermostat stops the flow of current to the HI side, only allowing current to flow to the LO side and thereby maintaining the temperature of the steering wheel.
(c) While operating to maintain the temperature of the steering wheel, if the temperature drops to the operation temperature of the control thermostat, the control thermostat restarts the flow of current to both the LO and HI sides to warm the steering wheel.
(d) While the steering heater switch is on, the control thermostat automatically stops and restarts the flow of current to the HI side according to the temperature of the steering wheel, continuously maintaining the specified temperature.
(e) If a malfunction occurs in the steering heater circuit and the temperature exceeds the specified temperature, the overheating prevention thermostat stops the flow of current to the circuit, the heater indicator light turns off and the heater stops operating.
READ NEXT:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use these procedures to troubleshoot the heated steering wheel system.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
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
SEE MORE:
VIN Not Programmed (P063051)
MONITOR DESCRIPTION DTC P063051 is stored when the Vehicle Identification Number (VIN) or frame number is not stored in the ECM or the stored VIN or frame number is not accurate.
DTC No. Detection Item
DTC Detection Condition Trouble Area
MIL Note
P063051 VIN Not Prog
Voice Recognition Microphone2 Circuit Open (B154913)
DESCRIPTION
The telephone microphone assembly RH is connected to the radio
and display receiver assembly via voice recognition microphone 2 signal detection
line.
This DTC is stored when the radio and display receiver assembly
detects disconnection of telephone microphone assembly RH.
