When trouble arises -> If the hybrid system will not start for Your Toyota Prius 4 Door Third Generation (2010-2015)

5-2. St eps t o t ak e in an em ergenc y  
If the hybrid system w ill not start  
Reasons for the hybrid system not starting vary depending on the  
situation. Check the following and perform the appropriate proce-  
dure:  
The hybrid system will not start even though the correct  
starting procedure is being followed (P. 192)  
One of the following may be the cause of the problem:  
The electronic key may not be functioning properly.*  
(P. 541)  
There may not be sufficient fuel in the vehicle’s tank.  
Refuel the vehicle.  
There may be a malfunction in the immobilizer system.*  
(P. 135)  
There may be a malfunction in the P position control system.*  
(P. 197, 509)  
*: It may not be possible to shift the shift position from P to another  
position.  
The interior lights and headlights are dim, or the horn does  
not sound or sounds at a low volume  
One of the following may be the cause of the problem:  
The 12-volt battery may be discharged. (P. 543)  
The 12-volt battery terminal connections may be loose or cor-  
roded.  
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5-2. Steps to take in an emergency  
The interior lights and headlights do not turn on, or the horn  
does not sound  
One of the following may be the cause of the problem:  
One or both of the 12-volt battery terminals may be discon-  
nected.  
The 12-volt battery may be discharged. (P. 543)  
Contact your Toyota dealer if the problem cannot be repaired, or if  
repair procedures are unknown.  
Emergency start function  
When the hybrid system does not start, the following steps can be  
used as an interim measure to start the hybrid system if the  
“POWER” switch is functioning normally:  
STEP  
STEP  
STEP  
1
2
3
Set the parking brake.  
Turn the “POWER” switch to ACCESSORY mode.  
Press and hold the “POWER” switch for about 15 seconds  
while depressing the brake pedal firmly.  
5
Even if the hybrid system can be started using the above steps, the  
system may be malfunctioning. Have the vehicle inspected by your  
Toyota dealer.  
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