01 toy rav 4 cly 2.0. this car sets a p1135, heater code. It has b1s1 and b1s2 and b1s2 and b2s2. All heaters are grd side controlled by the ecm. b1s1 and b2s1 share power control and wiring and separate grds through ecm. I amp probed all of the heaters and on... Login to read more.