Well I got the wiring harness all figured out (I think)! So I figured I better do a write-up now that its fresh in my head. I donÆt have it connected to the 4runner wiring yet, but everything is labeled and ready to go. IÆve got 30 connections that I need to make but thatÆs EVERYTHING to make all the gauges work, relays, grounds, fuel pump resistor, back up lights, 4wd indicator, ECU, etc. I hear you only technically need about 10-12 wires to make it run but I wanted to try to do it right the first time and not have to patch stuff in after the fact.



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Currently I could not find any good information on the web regarding what had to be done to the Cressida wiring harness to be able to wire the motor for a motor swap since the Supra and Cressida wiring harnesses are different. So with the resources of Cressida and Supra Factory Electrical Manuals, the info IÆve found on the web for the Supra swap and info I received from two locals that have done the swap using a Cressida, I starting striping my donor harness down one wire at a time. Basically what I did was just find all the wires that went to the motor and kept those while I cut everything else out and labeling everything as I go. After I got that done I took what I had left over and compiled the follow info:

Important Wiring Connections for 1989 Toyota Cressida, Non-California, US model.
Please refer to a Cressida FSM for wire numbers in the plugs as I donÆt feel like scanning a picture of each plug wire configuration.
(*) = means this must be connected to the vehicles wiring

B1 Connection - Dark Gray in color - located next to the intake plenum
Refer to as C1 Connection in a Supra
Wire Number, Description, Color
#1, *IGN SW2 from AM2 Fuse, B-R
#2, *IGN SW2 from AM2 Fuse, B-R
#3, *EFI Main Relay #4*, B-R w/ Red dots

N1 Connection û Gray in color - located under the EGR
Auto Transmission Indicator Switch
Wire Number, Description, Color
#1, *Backup Light Switch, R-B
#2, *Jumper to #3 to bypass Neutral Start Switch, B
#3, *Jumper to #2 to bypass Neutral Start Switch, B-W

N15 Connection û Gray in color - located under the EGR
Auto Transmission Indicator Switch
Wire Number, Description, Color
#1, *I made this my new 4WD Indicator (was park light), G-W
#2, Ignore
#3, Ignore
#4, Ignore
#5, *Backup Light Power, Y w/Red dots
#6, Ignore

C1 Connection û White in color wrapped in foam - located next to the ECU
Refer to as M1 Connection in a Supra
Wire Number, Description, Color
#1, *Tach, B-Y w/ Silver dots
#2, *Water Temp, Y-B w/ Silver dots
#3, *Ground, Br w/ Silver dots
#4, *Oil Pressure, Y w/ Silver dots
#5, Removed from plug
#6, *New 4WD Light, G-W w/ Silver dots
#7, Removed from plug
#8, Removed from plug
#9, Removed from plug
#10, Removed from plug
#11, Removed from plug
#12, Removed from plug

T3 Connection û Dark Gray in color - plugged into the ECU
Do nothing

T4 Connection û Dark Gray in color - plugged into the ECU
Do nothing

T5 Connection û Dark Gray in color - plugged into the ECU
Wire Number, Description, Color
#1, *EFI Main Relay #2, W-R w/ Red dots
#2, *IGN Fuse, B-W w/ Silver Dots
#3, Removed from plug
#4, *EFI Main Relay #3 (M-Rel), Gray w/ Red Dots
#5, *Check Engine, TDCL (W), Y-R w/ Silver dots
#6, Fuel Pump Relay #3, G-R w/ Silver dots
#7, TDCL (TT), LG w/ Silver dots
#8, Removed from plug
#9, *Speed Sensor, V-W w/ Silver dots
#10, Removed from plug
#11, Circuit Opening Relay #3 & Starter Fuse & Cold start Injector, B w/ Red dots
#12, *EFI Main Relay #4 (+B), B-R w/ Silver dots
#13, *EFI Main Relay #4 (+B1), B-R w/ Silver dots
#14, Removed from plug
#15, Removed from plug
#16, Removed from plug
#17, Removed from plug
#18, Removed from plug
#19, Removed from plug
#20, Removed from plug
#21, Removed from plug
#22, Neutral Start Switch, B-W w/ Silver dots

T6 Connection û Dark Gray in color - Under steering column
TDCL û Toyota Diagnostic Communication Link
Remove everything from this plug except the connections from B2 & T5

B2 Connection û Dark Gray in color - small plug located next to the ECU
Refer to as part of the B1 Connection in a Supra
Wire Number, Description, Color
#1, Removed from plug
#2, Removed from plug
#3, Removed from plug
#4, Removed from plug
#5, Removed from plug
#6, Removed from plug
#7, Removed from plug
#8, Removed from plug
#9, Removed from plug
#10, Removed from plug
#11, TDCL (TE2), LG-R w/ Silver dots
#12, TDCL (TE1), LG-B w/ Silver dots
#13, TDCL (ENG), Gray w/ Silver dots
#14, TDCL (E1), Brown w/ Silver dots
#15, Removed from plug
#16, Removed from plug

B3 Connection û Dark Gray in color - large plug located next to the ECU
Refer to as part of the B1 Connection in a Supra
Wire Number, Description, Color
#1, Removed from plug
#2, Removed from plug
#3, Removed from plug
#4, *Backup Lights, R-B w/ Silver dots
#5, Fuel Pump Relay #1, Circuit Opening Relay #1, G-W w/ Silver dots
#6, *Ground, W-B w/ Silver dots
#7, *Starter Relay #4, B-W
#8, *AC / OBA Clutch, B w/ Red dots
#9, *Starter Fuse #4, Circuit Opening Relay #3, Cold Start Injector, B w/ Silver dots
#10, Removed from plug
#11, Circuit Relay #4, G w/ Silver dots
#12, *Starter Fuse #1, B
#13, *Backup Light Power from Engine Fuse, Y w/ Silver dots
#14, Removed from plug

Circuit Opening Relay
Located in the RH side kick panel of donor Cressida
Wire Number, Description, Color
#1, Fuel Pump Relay #1, B3{#5}, G-W
#2, *EFI Main Relay #4, B-R
#3, Starter Fuse #4, T5{#11}, B3{#9}, B w/ Silver dots
#4, B3{#11}, G w/ Silver dots
#5, Removed
#6, *Ground, W-B w/ Silver dots

Fuel Pump Relay
Located in the RH side kick panel of donor Cressida
Wire Number, Description, Color
#1, Circuit Opening Relay #1, G-W
#2, Fuel Pump Resistor #1, G-B w/ Red dots
#3, T5{#6}, G-R w/ Silver dots
#4, *Fuel Pump, Fuel Pump Resistor #2, B-R

The items/connections that IÆm reusing from my 85 4runner originally equipped with a 22RE are as folllows:

EFI Fuse
Alternator Wiring
4Runner fuse box
SR5 dash
SR5 oil pressure sender