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SEC-202 < ECU DIAGNOSIS > [COUPE] IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) If No CAN Communication Is Available With BCM IGNITION RELAY MALFUNCTION DETECTION FUNCTION • IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it. • IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation coil circuit. • If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to alert the user to the ignition relay malfunction when the ignition switch is turned OFF. NOTE: FRONT WIPER CONTROL IPDM E/R detects front wiper stop position by a front wiper auto stop signal. When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper after repeating a front wiper 10 second activation and 20 second stop five times. NOTE: This operation status can be confirmed on the IPDM E/R “Data Monitor” that displays “BLOCK” for the item “WIP PROT” while the wiper is stopped. Control part Fail-safe in operation Cooling fan • Signals cooling fans ON when the ignition switch is turned ON A/C compressor A/C relay OFF Generator Outputs the power generation command signal (PWM signal) 0% Control part Fail-safe in operation Headlamp • Turns ON the headlamp low relay when the ignition switch is turned ON • Parking lamps • Turns ON the tail lamp relay when the ignition switch is turned ON Front wiper • The status just before activation of fail-safe control is maintained until the ignition switch is turned OFF while the front wiper is operating at LO or HI speed. • The wiper is operated at LO speed until the ignition switch is turned OFF if the fail- safe control is activated while the front wiper is set in the INT mode and the front wiper Front fog lamps (if equipped) Front fog lamp relay OFF Horn Horn OFF Ignition relay The status just before activation of fail-safe is maintained. Starter motor Starter control relay OFF Electronic steering column lock unit Electronic steering column lock relay OFF DTC Ignition switch Ignition relay Tail lamp relay — ON ON — — OFF OFF — B2098: IGN RELAY ON OFF ON ON (10 minutes) B2099: IGN RELAY OFF ON OFF — Ignition switch Front wiper switch Auto stop signal ON OFF Front wiper stop position signal cannot be ON The signal does not change for 10 seconds. |