DESCRIPTION
PTC HTR heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heater unit.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Check the operation by referring to the table below.
Air Conditioner
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Heater Active Level |
Quick heater assembly |
Min.: 0, Max.: 3 |
- |
OK:
Heater Active Level changes normally.
NG |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT PTC HTR RELAY |
(a) Remove the PTC HTR relays.
(b) Inspect the PTC HTR relays (See page ).
NG |
REPLACE PTC HTR RELAY |
|
3. |
CHECK HARNESS AND CONNECTOR (PTC HTR RELAY - POWER SOURCE CIRCUIT) |
(a) Remove the PTC HTR relays.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 1-5 - Body ground |
Always |
11 to 14 V |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 2-5 - Body ground |
Always |
11 to 14 V |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 3-5 - Body ground |
Always |
11 to 14 V |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (PTC HTR RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Remove the PTC HTR relays.
(b) Disconnect the A14 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-2 - A14-15 (PTC1) |
Always |
Below 1 Ω |
PTC HTR NO. 1-2 or A14-15 (PTC1) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-2 - A14-14 (PTC2) |
Always |
Below 1 Ω |
PTC HTR NO. 2-2 or A14-14 (PTC2) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-2 - A14-13 (PTC3) |
Always |
Below 1 Ω |
PTC HTR NO. 3-2 or A14-13 (PTC3) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (QUICK HEATER ASSEMBLY - PTC HTR RELAY AND BODY GROUND) |
(a) Remove the PTC HTR relays.
(b) Disconnect the Q1 quick heater assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-3 - Q1-3 (B) |
Always |
Below 1 Ω |
Q1-2 (E) - Body ground |
Always |
Below 1 Ω |
Q1-4 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 1-3 or Q1-3 (B) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-3 - Q1-1 (B) |
Always |
Below 1 Ω |
Q1-2 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 2-3 or Q1-1 (B) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-3 - Q1-5 (B) |
Always |
Below 1 Ω |
Q1-4 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 3-3 or Q1-5 (B) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT QUICK HEATER ASSEMBLY |
(a) Remove the quick heater assembly (See page ).
(b) Inspect the quick heater assembly (See page ).
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPLACE QUICK HEATER ASSEMBLY |
Communication Error from VSC to ECM (P1630)
DESCRIPTION
The skid control ECU (brake actuator assembly) sends signals such as cruise control
cancel signals and brake demand response signals to the ECM when the dynamic radar
cruise control system is operating.
DTC No.
Detection Item
DTC Detection Condition ...
Using the radio
Select “AM” or “FM” on the “Select Audio Source” screen to begin listening
to the radio.
Audio control screen
“Select Audio Source” screen
appears
Preset stations
Select to display RBDS text
message
Scanning for receivable station
Sele ...
Invalid Data Received From Vehicle Dynamics Control Module (U0416)
DESCRIPTION
This DTC is detected if a wheel speed malfunction signal is sent from the skid
control ECU (brake actuator assembly).
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
U0416
Invalid Data Received From V ...