Measure the voltage between fuse block
terminals 1B and 2F.
Is the voltage between 8.5
16 V ?
No
Inspect fuses, ACC relay and related wiring harnesses
between the battery and fuse block.
• If there is any malfunction, repair or replace the
applicable part.
Yes Go to the next step.
4
Install the ROOM 15 A fuse and ACC
7.5 A fuse.
Turn the ignition switch to the ACC
position.
Measure the voltage at the audio unit
connector terminals 1B and 1R.
Is the voltage between 8.5
16 V ?
No
Repair the wiring harness between the fuse block and
base unit.
Yes
Replace the base unit. (See AUDIO UNIT
DISASSEMBLY/ASSEMBLY .)
5
Turn the ignition switch to the ACC or
ON position and hold for 30 s or more .
Is DTC 09: Er20 displayed?
No DTC troubleshooting completed.
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