TERMINALS OF ECU
1. CHECK FRONT POWER SEAT SWITCH LH
(a) Disconnect the b18 and b19 connectors from the front power seat switch LH.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
b18-2 (GND1) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
b18-7 (+B1) - b18-2 (GND1) |
W - W-B |
Power source |
Always |
11 to 14 V |
b19-12 (SYSB) - b18-2 (GND1) |
P - W-B |
System power source |
Always |
11 to 14 V |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the b18 and b19 switch connectors.
(d) Measure the voltage according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
b18-3 (SLD+) - b18-2 (GND1) |
L - W-B |
Sliding motor signal (forward) |
Slide switch off |
Below 1 V |
Slide switch on (Forward) |
11 to 14 V |
|||
b18-4 (SLD-) - b18-2 (GND1) |
GR - W-B |
Sliding motor signal (rearward) |
Slide switch off |
Below 1 V |
Slide switch on (Rearward) |
11 to 14 V |
|||
b18-5 (FRV-) - b18-2 (GND1) |
R - W-B |
Front vertical motor signal (downward) |
Front vertical switch off |
Below 1 V |
Front vertical switch on (Downward) |
11 to 14 V |
|||
b18-6 (+B2) - b18-1 (GND2) |
SB - W-B |
Power source |
Always |
11 to 14 V |
b18-8 (FRV+) - b18-2 (GND1) |
B - W-B |
Front vertical motor signal (upward) |
Front vertical switch off |
Below 1 V |
Front vertical switch on (Upward) |
11 to 14 V |
|||
b18-9 (RCL+) - b18-2 (GND1) |
P - W-B |
Reclining motor signal (forward) |
Reclining switch off |
Below 1 V |
Reclining switch on (Forward) |
11 to 14 V |
|||
b18-11 (RCL-) - b18-2 (GND1) |
LG - W-B |
Reclining motor signal (rearward) |
Reclining switch off |
Below 1 V |
Reclining switch on (Rearward) |
11 to 14 V |
|||
b18-10 (LFT+) - b18-2 (GND1) |
V - W-B |
Lifter motor signal (upward) |
Lifter switch off |
Below 1 V |
Lifter switch on (Upward) |
11 to 14 V |
|||
b18-12 (LFT-) - b18-2 (GND1) |
G - W-B |
Lifter motor signal (downward) |
Lifter switch off |
Below 1 V |
Lifter switch on (Downward) |
11 to 14 V |
|||
b19-1 (SGND) - b18-2 (GND1) |
BR - W-B |
Ground |
Always |
Below 1 Ω |
b19-3 (SSFV) - b19-1 (SGND) |
R - BR |
Front vertical position signal |
Front vertical function operating |
4.5 to 4.8 V |
b19-4 (SSRL) - b19-1 (SGND) |
P - BR |
Lifter position signal |
Lifter function operating |
4.5 to 4.8 V |
b19-5 (SSRS) - b19-1 (SGND) |
G- BR |
Slide position signal |
Slide function operating |
4.5 to 4.8 V |
b19-11 (SSRR) - b19-1 (SGND) |
V - BR |
Reclining position signal |
Reclining function operating |
4.5 to 4.8 V |
If the result is not as specified, the front power seat switch LH may have a malfunction.
2. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Remove the main body ECU (multiplex network body ECU) (See page ).
(b) Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
A-30 (BECU) - Body ground |
- |
Power source |
Always |
11 to 14 V |
A-32 (IG) - Body ground |
- |
Power source (IG) |
Engine switch on (IG) |
11 to 14 V |
Engine switch off |
Below 1 V |
|||
A-11 (GND1) - Body ground |
- |
Ground |
Always |
Below 1 Ω |
F10-3 (GND2) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
Inspection
INSPECTION
PROCEDURE
1. INSPECT SEAT HEATER SWITCH LH
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Switch Condition
Specified Condition
...
No Communication in Immobiliser System (B2796,B2798)
DESCRIPTION
DTC B2796 is stored when a key is inserted into the ignition key cylinder
but no communication occurs between the key and transponder key ECU assembly.
DTC B2798 is stored when a key is inserted into the ignition key cylinder
...