Inspection Procedure 2: The combiner does not work, open or close normally even if combiner open/close switch is operated: Diagnosis
- STEP 1. Using scan tool (M.U.T.-IIISE), check special function.
By using the special function of the HUD, check whether the combiner can be opened/closed.
CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).- Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
- Turn the ignition switch to the "ON" position. Operation check
- Item 1: Combiner Open (Refer to SPECIAL FUNCTION TABLE ).
- Item 2: Combiner Close (Refer to SPECIAL FUNCTION TABLE
).
OK: The combiner is opened/closed normally.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Go to Step 2.
- STEP 2. Combiner visual inspection CAUTION: Since the internal mechanism of the HUD is damaged, do not close the combiner manually. (It is automatically stored with turning the ignition switch ON.)
If the combiner does not open, turn OFF the ignition switch to open the combiner slowly by hand, and check that no foreign object is caught around the combiner, and that there is no dust etc. adhering to the bearing section.
Q: Is the check result normal?
YES: Go to Step 6.
NO: Remove foreign objects and dust.
- STEP 3. Resistance measurement at HUD connector (O/C, SW- terminal).
- Disconnect the HUD and HUD switch connector, and measure at the wiring harness side.
- Measure the resistance between the HUD connector (O/C) and HUD switch connector terminal No. 8
OK: The resistance should be 2 ohms or less
- Measure the resistance between the HUD connector (SW-) and HUD switch connector terminal No. 11
OK: The resistance should be 2 ohms or less
Q: Is the check result normal?
YES: Go to Step 4.
NO: Correct the circuit between the HUD connector and HUD switch connector (O/C or SW - terminal).
- STEP 4. Check the HUD switch.
Check the continuity at the HUD switch (between terminals No. 8 and 11). Refer to HUD SWITCH .
Q: Is the check result normal?
YES: Go to Step 5.
NO: Replace the HUD switch.
- STEP 5. Using scan tool (M.U.T.-IIISE), check data list.
Check the input signal of the combiner open/close switch by using the service data of the HUD.
- When the combiner open/close switch is operated.
Item No. Item name Normal condition 1 HUD SW ON - When the combiner open/close switch is not operated.
Item No. Item name Normal condition 1 HUD SW OFF OK: Normal conditions are displayed for all the items.
Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the HUD.
- When the combiner open/close switch is operated.
- STEP 6. Retest the system
Check whether the combiner works normally by operating the combiner open/close switch.
Q: Is the check result normal?
YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
NO: Replace the HUD.