DTC P0A1F-150: Battery Energy Control Module; DTC P0A1F-157: Battery Energy Control Module: Procedure

1. Measure the voltage between the terminals of the auxiliary battery.

   Standard voltage

   11 to 14 V (Battery electrolyte temperature: 20°C (68°F))

NG → CHARGE OR REPLACE AUXILIARY BATTERY 

OK: Go to next step 

1. Turn the power switch off and remove the service plug grip. Refer to PRECAUTION .
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Remove the luggage compartment trim cover front. Refer to REMOVAL .
3. Disconnect the frame wire. Refer to REMOVAL .
4. Remove the battery bracket sub-assembly. Refer to REMOVAL .
5. Connect the auxiliary battery positive terminal cable of the frame wire.
6. Disconnect the n2 battery smart unit connector.
7. Turn the power switch on (IG).
8. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying n2 Battery Smart Unit Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   IGC1 (n2-1) - GND (n2-5)	8.6 V or more

OK → See step   5 

NG: Go to next step 

1. Remove the IGCT No. 2 fuse from the engine room R/B.
   Fig 2: Identifying IGCT No. 2 Fuse Schematic Location

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   IGCT No. 2 fuse terminal	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Install the IGCT No. 2 fuse to the engine room R/B.
2. Remove the IGCT relay from the engine room R/B.
3. Disconnect connector n2 from the battery smart unit.
4. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying IGCT Relay Connector Terminal Identification & Schematic

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Specified Condition
   IGC1 (n2-1) - Engine room R/B IGCT Relay terminal 5	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → CHECK AND REPAIR POWER SOURCE CIRCUIT