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DTC 09 ERR20 OR 09:ER20

BME090266900206

DTC 09 ERR20 or 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 | INSPECT FUSE • Remove CIGAR 25 A fuse and ROOM 15 A fuse. • Inspect CIGAR 25 A fuse and ROOM 15 A fuse. • Are fuses okay? | Yes | Go to next step.
No | Replace fuse.
2 | INSPECT BATTERY • Measure battery voltage. • Is voltage 8.5 V -16 V? | Yes | Go to next step.
No | Battery is weak. • Inspect charge/discharge system.
3 | INSPECT WIRING HARNESS BETWEEN BATTERY AND FUSE BLOCK • Turn ignition switch to ACC position. • Measure voltage at fuse block connector(JB-02) terminal A and fuse block connector(JB-03) terminal G • voltage 8.5 V -16 V? | Yes | Go to next step.
No | Repair wiring harness between battery and fuse block.
4 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND BASE UNIT • Install CIGAR 25 A fuse and ROOM 15 A fuse. • Measure voltage at base unit connector terminals 1B and 1R. • Is voltage 8.5 V -16 V? | Yes | Go to next step.
No | Repair wiring harness between fuse block and base unit.
5 | INSPECT BASE UNIT • Clear DTC. • Turn ignition switch to ACC or ON position and hold for 30 seconds or more. • Start on-board diagnostic test mode. • Is DTC 09 ERR20 or 09:Er20 displayed? | Yes | Replace base unit.
No | Troubleshooting completed.