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DTC 09:ER20

BHE090266900W06

DTC 09:Er20 | Power supply circuit of base unit
DETECTION CONDITION | • Voltage detected at base unit terminals 1B and 1R is less than 8.5 V, or more than 16 V (must not be 16V).
POSSIBLE CAUSE | • Weak battery • Malfunction in wiring harness between battery and base unit

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | Remove the ROOM 15 A fuse and ACC 7.5 A fuse. Are the fuses normal? | Yes | Go to the next step.
No | Replace the fuse.
2 | Measure the battery voltage. Is the voltage between 8.5-16 V? | Yes | Go to the next step.
No | Battery malfunction Inspect the charge/discharge system.
3 | Measure the voltage between fuse block terminals 1B and 2F. Is the voltage between 8.5-16 V? | Yes | Go to the next step.
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.
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? | Yes | Go to the next step.
No | Repair the wiring harness between the fuse block and base unit.
5 | Turn the ignition switch to the ACC or ON position and hold for 30 s or more. Is DTC 09: Er20 displayed? | Yes | Replace the base unit.
No | DTC troubleshooting completed.