DESCRIPTION
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
PROCEDURE
1. | CHECK IG1-MAIN RELAY |
(a) Remove the IG1-MAIN relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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NG | ![]() | REPLACE IG1-MAIN RELAY |
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2. | CHECK HARNESS AND CONNECTOR (IG1-MAIN RELAY POWER SOURCE) |
(a) Remove the IG1-MAIN relay from the engine room relay block.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
5 (IG1-MAIN relay) - Body ground | Always | 11 to 14 V |
1 (IG1-MAIN relay) - Body ground | Engine switch on (IG) | 11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
2 (IG1-MAIN relay) - Body ground | Always | Below 1 Ω |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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3. | CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) POWER SOURCE) |
(a) Disconnect the J84 steering heater switch (integration control and panel assembly) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
J84-4 (IG1) - Body ground | Engine switch on (IG) | 11 to 14 V |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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4. | CHECK STEERING HEATER SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) |
(a) Disconnect the J84 steering heater switch (integration control and panel assembly) connector.
(b) Measure the voltage according to the value(s) in the table below. HINT: As the circuit has a diode, perform the measurement in diode test mode, and do not mistake the polarity. Standard Voltage:
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J84-4 (IG1) - J84-16 (ECU) | Steering heater switch (Integration control and panel assembly) is pushed | Below 1 Ω |
Steering heater switch (Integration control and panel assembly) is not pushed | 10 kΩ or higher |
NG | ![]() | REPLACE STEERING HEATER SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) |
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5. | CHECK HARNESS AND CONNECTOR (IG1-MAIN RELAY - SPIRAL CABLE SUB-ASSEMBLY) |
(a) Remove the IG1-MAIN relay from the engine room relay block.
(b) Disconnect the J23 spiral cable sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
3 (IG1-MAIN Relay) - J23-4 (BHT) | Always | Below 1 Ω |
3 (IG1-MAIN Relay) or J23-4 (BHT) - Body ground | Always | 10 kΩ or higher |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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6. | CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) - SPIRAL CABLE SUB-ASSEMBLY) |
(a) Disconnect the J84 steering heater switch (integration control and panel assembly) connector.
(b) Disconnect the J23 spiral cable sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J84-9 (IND) - J23-1 (BTM) | Always | Below 1 Ω |
J84-16 (ECU) - J23-3 (ETM) | Always | Below 1 Ω |
J84-9 (IND) or J23-1 (BTM) - Body ground | Always | 10 kΩ or higher |
J84-16 (ECU) or J23-3 (ETM) - Body ground | Always | 10 kΩ or higher |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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7. | INSPECT SPIRAL CABLE SUB-ASSEMBLY |
(a) Check the connectors and cables of the spiral cable sub-assembly .
OK:
There are no defects such as scratches, cracks, dents or damage on the connectors or cables.
(b) Disconnect the J23 and z11 spiral cable sub-assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
*a | Component without harness connected (Spiral Cable Sub-assembly) | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
z11-2 (BTM) - J23-1 (BTM) | Always | 3 Ω or less |
z11-3 (ETM) - J23-3 (ETM) | Always | 3 Ω or less |
z11-1 (EHT) - J23-2 (EHT) | Always | Below 0.1 Ω |
z11-4 (BHT) - J23-4 (BHT) | Always | Below 0.1 Ω |
NG | ![]() | REPLACE SPIRAL CABLE SUB-ASSEMBLY |
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8. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY BODY GROUND) |
(a) Disconnect the J23 spiral cable sub-assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J23-2 (EHT) - Body ground | Always | Below 1 Ω |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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9. | INSPECT STEERING WHEEL HEATER UNIT (THERMISTOR/HEATER/THERMOSTAT) |
(a) Disconnect the B steering vibration and heater ECU connector. |
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
B-3 (TH1) - B-2 (TH2) | 10 to 30°C (50 to 86°F) | 4.228 to 8.701 kΩ |
B-5 (SH1) - B-1 (SH2) | 20°C (68°F) | 2.43 to 2.89 Ω |
OK | ![]() | REPLACE STEERING VIBRATION AND HEATER ECU |
NG | ![]() | REPLACE STEERING WHEEL ASSEMBLY |
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