Clock System - (Diagnostics & Circuit Tests): Overview Toyota Highlander II рестайлинг

DESCRIPTION

1. w/o Multi-information Display: The clock assembly uses this circuit to receive the illumination signal via the direct line. The combination meter assembly controls illumination through the ILL+ terminal.
2. w/ Multi-information Display: The clock assembly uses this circuit to receive the auto dimmer signal and tail cancel signal. When the clock assembly receives an auto dimmer signal from the main body ECU through the combination meter assembly via the direct line, the combination meter assembly causes the clock display to be dimmed. When the meter CPU receives an auto dimmer signal, it dims the meter illumination and clock illumination. The main body ECU determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor. If the main body ECU determines that it is daytime, the ECU does not send auto dimmer signals. Therefore, the clock illumination (multi-information display) will not dim even if the driver accidentally turns the light control switch to the TAIL or HEAD position in daytime. HINT: If the automatic light control sensor has a malfunction, DTC B1244 is output, refer to «DTC B1244: Light Sensor Circuit Malfunction»(ref-422541-S37493069742011092600000)

Scheme 1752

Scheme 1753

1. w/o Multi-information Display
2. w/ Multi-information Display

Scheme 1754

Scheme 1755

Scheme 1756

Scheme 1757

1. CONFIRM SYMPTOMS Confirm the symptom. Result Result Proceed to Only clock illumination has a malfunction. A Clock illumination, combination meter assembly illumination, and heater control panel illumination have a malfunction. B B --> See step 9 A: Go to next step
2. SYSTEM CHECK Confirm the vehicle model. Result Result Proceed to w/o Multi-information Display A w/ Multi-information Display B B --> See step 5 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER) Disconnect E1 and E20 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E20-3 (ILL+) - E1-30 (ILL-) Always Below 1 ohms E1-30 (ILL-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT CLOCK ASSEMBLY Reconnect the E20 connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition E1-30 (ILL-) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD 11 to 14 V E1-30 (ILL-) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V NG --> See step 10 OK --> See step 11
5. CHECK CAN COMMUNICATION SYSTEM Check if any DTC is output, refer to «DIAGNOSIS SYSTEM»(ref-422513-S25038406522011092600000) . Result Result Proceed to CAN communication DTC is not output. A CAN Communication DTC is output. B B --> See step 12 A: Go to next step
6. PERFORM ACTIVE TEST USING TECHSTREAM Connect Techstream to the DLC3. Ignition switch on (IG). Turn the tester ON. Enter the following menus: Body Electrical / Main Body / Data List. Check the clock illumination. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Illumination Rate Info Illumination rate information / 0 ms. to 99 ms. 0.8 to 22.0 ms to (Value is output according to outside illuminance) Confirm that the vehicle is stopped, engine idling OK The value changes according to the illuminance. HINT: Refer to the sensitivity setting in the customization table of the lighting system, refer to «CUSTOMIZE PARAMETERS»(ref-422488-S26004081952011092600000) . NG --> See step 7 OK --> See step 13
7. CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER) Disconnect the E1 and E11 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E11-9 (CLK) - E1-36 (MCLK) Always Below 1 ohms E11-10 (DATA) - E1-37 (MDAT) Always Below 1 ohms E11-11 (SYNC) - E1-38 (SYNC) Always Below 1 ohms E1-36 (MCLK) - Body ground Always 10 kohms or higher E1-37 (MDAT) - Body ground Always 10 kohms or higher E1-38 (SYNC) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. INSPECT COMBINATION METER ASSEMBLY Reconnect the E1 connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition E11-9 (CLK) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD Pulse generation E11-10 (DATA) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD Pulse generation E11-11 (SYNC) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD Pulse generation E11-9 (CLK) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V E11-10 (DATA) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V E11-11 (SYNC) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V NG --> See step 11 OK --> See step 10
9. GO TO METER / GAUGE SYSTEM. Refer to «Clock Display Circuit»(ref-422465-S32909466612011092600000)
10. REPLACE CLOCK ASSEMBLY. Refer to «REMOVAL»(ref-422505-S01416839092011092600000)
11. REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL»(ref-422505-S36751183422011092600000)
12. GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-422513-S27444512412011092600000)
13. GO TO LIGHTING SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422488-S22872709792011092600000)

This circuit is the power source for the clock assembly. This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission.

HINT

If the clock assembly displays "1:00" when the ignition switch off, then on (IG) again, the B (*1) or +B (*2) terminal has a malfunction.

The maximum clock assembly margin of error is -4 to 4 seconds per day when the temperature is between -20°C (-4°F) and 60°C (140°F).

1. *1: w/o Multi-information Display
2. *2: w/ Multi-information Display

Scheme 1758

Scheme 1759

1. w/o Multi-information Display
2. w/ Multi-information Display

Scheme 1760

1. CHECK HARNESS AND CONNECTOR Disconnect the E20 (*1) or E11 (*2) connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition E20-1 (B) (*1) - Body ground Always 11 to 14 V E11-6 (+B) (*2) - Body ground Always 11 to 14 V E20-4 (ACC) (*1) - Body ground Ignition switch on (ACC) 11 to 14 V E11-1 (IG) (*2) - Body ground Ignition switch on (IG) 11 to 14 V *1: w/o Multi-information Display *2: w/ Multi-information Display Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E20-2 (E) (*1) - Body ground Always Below 1 ohms E11-5 (GND) (*2) - Body ground Always Below 1 ohms *1: w/o Multi-information Display *2: w/ Multi-information Display Result Result Proceed to OK (w/o Multi-information Display) A OK (w/ Multi-information Display) B NG C B --> See step 2 C --> REPAIR OR REPLACE HARNESS OR CONNECTOR A --> See step 3
2. REPLACE CLOCK ASSEMBLY (w/ Multi-information Display). Refer to «REMOVAL»(ref-422505-S36751183422011092600000)
3. REPLACE CLOCK ASSEMBLY (w/o Multi-information Display). Refer to «REMOVAL»(ref-422505-S01416839092011092600000)