Heated Glass Element: Description and Operation

System Description
The rear window defogger system is controlled by BCM (body control module) and IPDM E/R (intelligent power distribution module engine room).

The rear window defogger operates only for approximately 15 minutes.

Power is supplied at all times
- through 20 A fuses (No. 32, and 37, located in the IPDM E/R)
- to rear window defogger relay terminals 3 and 6
- through 50 A fusible link (letter f, located in the fuse and fusible link box)
- to BCM terminal 55.

With the ignition switch turned to ON or START position, power is supplied
- through 10 A fuse [No. 12, located in the fuse block (J/B)]
- to rear window defogger relay terminal 1
- to unified meter and A/C amp. terminal 22
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to BCM terminal 38.

Ground is supplied
- to BCM terminal 52
- to unified meter and A/C amp. terminal 29 and 30
- through body grounds M57, M61 and M79
- to IPDM E/R terminals 38 and 60
- through body grounds E15 and E24.

When unified meter and A/C amp. (rear window defogger switch) is turned to ON, ground is supplied
- to BCM terminal 9
- through unified meter and A/C amp. terminal 38
- through unified meter and A/C amp. terminal 29 and 30
- through body grounds M57, M61 and M79.

Then rear window defogger switch is illuminated.

Then BCM recognizes that rear window defogger switch is turned to ON.

Then it sends rear window defogger switch signals to IPDM E/R and display control unit (with navigation) or display unit (without navigation) via data line (CAN-H, CAN-L).

When display control unit (with navigation) or display unit (without navigation) receives rear window defogger switch signals, and display on the screen.

When IPDM E/R receives rear window defogger switch signals, ground is supplied
- to rear window defogger relay terminal 2
- through IPDM E/R terminal 52
- through IPDM E/R terminal 60
- through body grounds E15 and E24.

Then rear window defogger relay is energized.

With power and ground supplied, rear window defogger filaments heat and defog the rear window.

When rear window defogger relay is turned to ON (with door mirror defogger), power is supplied
- through rear window defogger relay terminals 5 and 7
- through fuse block (J/B) terminal 2Q
- through 10 A fuse [No. 8, located in the fuse block (J/B)]
- through fuse block (J/B) terminal 5N
- to door mirror (LH and RH) terminal 2.

Door mirror (LH and RH) terminal 1 is grounded through body grounds M57, M61 and M79.

With power and ground supplied, rear window defogger filaments heat and defog the rear window and door mirror defogger filaments heat and defog the mirror.

CAN Communication System Description
Refer to Information Bus.