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MWI-84 < ECU DIAGNOSIS INFORMATION > 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 of the ignition relay inside and ignition switch status from BCM via CAN communication. • IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the ignition switch status from BCM via CAN communication. • 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. FRONT WIPER CONTROL IPDM E/R detects front wiper stop position by a front wiper stop position signal. Control part Fail-safe operation Cooling fan • The cooling fan relay-1, the cooling fan relay-2 and the cooling fan relay-3 turn ON when the ignition switch is turned ON (Cooling fan HI operation) • The cooling fan relay-1, the cooling fan relay-2 and the cooling fan relay-3 turn OFF when the ignition switch is turned OFF A/C compressor A/C relay OFF Alternator Outputs the power generation command signal (PWM signal) 0% Control part Fail-safe 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 Front fog lamp relay OFF Rear window defogger relay Rear window defogger relay OFF Horn Horn OFF Voltage judgment IPDM E/R judgment Operation Ignition relay contact side Ignition switch status from BCM ON ON Ignition relay ON normal — OFF OFF Ignition relay OFF normal — ON OFF Ignition relay ON stuck • Detects DTC “B2098: IGN RELAY ON” utes OFF ON Ignition relay OFF stuck Detects DTC “B2099: IGN RELAY OFF” Ignition switch Front wiper switch Front wiper stop position signal ON OFF The front wiper stop position signal (stop ON The front wiper stop position signal does |