Meter Illumination is Always Dark: Wiring Diagram

for Automatic A/C:

Fig 1: Identifying ECU & CAN Communication Wiring Diagram (For Automatic A/C)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
for Manual A/C:

Fig 2: Identifying ECU & CAN Communication Wiring Diagram (For Manual A/C)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002