2007年雷克萨斯es350原厂维修手册ileaflex07rm07rmsoures350rm20380049

1、NS176NAVIGATION NAVIGATION SYSTEMDESCRIPTIONThe navigation ECU receives a vehicle speed signal from the multi-display and information about the GPS antenna, and then adjusts vehicle position.HINT: A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is

2、 changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal. If a short occurs in an ECU, all systems in the diagram below will not operate normally.WIRING DIAGRAM NSfrom Tire PressureWarning ECUNavigation ECUMulti-displayf

3、rom Stereo14164ComponentE62 SPDSPDp1p2SPD Amplifierfrom Windshield Wiper Relayfrom Main Body ECUCombination Meter12from Speed+SE20Sensorfrom ECMfrom Transmission Control ECUE134679E01Vehicle Speed Signal Circuit between Navigation ECU and Multi- DisplayNS177NAVIGATION NAVIGATION SYSTEMPECTION PROCED

4、URE(a) Enter the Display Check Mode (Vehicle Signal Check) (See page NS-21).(b) While driving, compare the Speed indicator to the reading on the speedometer. Check if these readings are almost the same.OK:The readings are almost the same.NGOK(a)(b)Disconnect the navigation ECU connector p2. Measure

5、voltage.(1)(2)(3)Jack up either one of the drive wheels. Move the shift lever to the neutral position. Turn the engine switch on (IG).NS(4)Measure the voltage between terminal SPD of the navigation ECU and body ground when the drive wheels are turned slowly.OK:Voltage pulses as shown in the illustra

6、tion.OKREPLACE NAVIGATION ECU4.5 to 14 VBelow 2 V0Turn the wheelE110855E01Wire Harness View:p2SPDE124079E012PECT NAVIGATION ECUGO TO VEHICLE SPEED SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND COMBINATION METERE124078E011CHECK VEHICLE SIGNAL (DISPLAY CHECK MODE)NS178NAVIGATION NAVIGATION SYSTEMNG(a) Disc

7、onnect the multi-display connector p1 and navigation ECU connector p2.(b) Measure the resistance according to the value(s) in the table below.Standard resistanceNGOK NSREPLACE MULTI-DISPLAYREPAIR OR REPLACE HARNESS OR CONNECTORTester ConnectionConditionSpecified ConditionSPD - SPDAlwaysBelow 1 WSPD - Body groundAlways10