Initial Inspection and Diagnostic Overview
Multiplex Integrated Control System Self-Diagnostic Function
Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2
Test Mode 1
Check the ECM/PCM for DTCs and troubleshoot ECM/PCM or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.
1. Check the No. A29 (10 A) fuse in the under-hood fuse/relay box and the No. B5 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is blown, find and correct the cause, then replace the fuse.
2. Move the interior light switch to the DOOR position.
NOTE: Do steps 3 to 7 within 10 seconds.
3. Turn the ignition switch to ON (II).
4. Pull and hold the combination light switch in its Passing position.
5. While holding the switch, turn on the headlights, then release, pull, and hold the combination switch in its Passing position.
6. Turn off the headlights, then turn the headlights ON and OFF two times.
7. Release the combination light switch.
8. Wait 5 seconds, and watch the individual map lights, ceiling light, and ignition key light. When the lights flash quickly once and then go off, the system is in Test Mode 1.
9. Check for B-CAN DTCs indicated by the information display or multi-information display while still in Test Mode 1. Press the SEL/RESET button to display the next code. After you get to the last code, the display shows END. If no DTCs are stored, the display reads NO.
NOTE: If the test times out, turn the ignition switch to LOCK (0), and repeat steps 3 to 7.
10. Record all DTCs and troubleshoot them in this order:
* Battery voltage DTCs
* Internal error DTCs
* Loss of communication DTCs
* Signal error DTCs
11. Clear the DTCs by pressing and holding the SEL/RESET button for about 10 seconds.
12. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes.
Test Mode 2
NOTE: Do steps 13 to 17 within 10 seconds.
13. Pull and hold the combination light switch in its Passing position.
14. While holding the switch, turn on the headlights, then release, pull, and hold the combination switch in its Passing position.
15. Turn off the headlights, then turn the headlights ON and OFF two times.
16. Release the combination light switch.
17. Wait 5 seconds, and watch the individual map lights and ignition key light. When the lights flash two times quickly and then go off, the system is in Test Mode 2.
NOTE: If you repeat this procedure, the system automatically returns to Test Mode 1.
18. The following tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is OK, the individual map lights, ceiling light, and ignition key light blink once. If the circuit is faulty, there is no such indication.
* If the front individual map lights, ceiling light, and ignition key light do not blink even when a switch is operated, check two or three other circuits listed in the table. If the front individual map lights, ceiling light, and ignition key light blink for each circuit, the additional circuits are OK; repair the short or open circuit that failed the test in step 18.
* If the front individual map lights, ceiling light, and ignition key light do not blink again, this means that the control unit has failed without triggering a DTC. Test a few more circuits. If they also fail, check the related control units using their input tests.
*: A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.