Lexus NX manuals

Lexus NX: Ignition Switch Run Position Circuit High (P2532-772)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Ignition Switch Run Position Circuit High (P2532-772)

DESCRIPTION

The hybrid vehicle control ECU monitors the IGSW signals sent from the smart key ECU assembly (certification ECU) and detects a malfunction.

HINT:

If DTC P2532-772 is stored, the vehicle will turn off (READY off).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P2532-772

Ignition Switch Run Position Circuit High

When communication is lost from ECU that has IG1 circuit power supply and power is supplied to IG2 terminal

(1 trip detection logic)
  • CAN communication system
  • Wire harness or connector
  • IG2-MAIN relay
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Turn the power switch on (IG) and wait for 15 seconds or more.
  2. Turn the power switch off and wait for 30 seconds or more.

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

(e) Turn the power switch off.

DTCs except P2532-772 are output.

GO TO STEP 6

P2532-772 only is output.

2.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: System Select / CAN Bus Check.

CAN Bus Check

Result

Proceed to

All of the ECUs and sensors that are currently connected to the CAN communication system are displayed.

A

None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed.

B

(d) Turn the power switch off.

B

GO TO CAN COMMUNICATION SYSTEM

A

3.

CHECK HARNESS AND CONNECTOR (+B SHORT)

(a) Disconnect the A60 hybrid vehicle control ECU connector.

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A60-3 (IG2) - Body ground

Power switch off

1 V or less

(c) Reconnect the A60 hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

4.

INSPECT RELAY (IG2-MAIN)

(a) Remove the IG2-MAIN relay from the No. 1 engine room relay block.

*1

No. 1 Engine Room Relay Block

*2

IG2-MAIN Relay

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

Auxiliary battery voltage is applied between terminals 1 and 2

Below 1 Ω

*1

IG2-MAIN Relay

(c) Install the IG2-MAIN relay.

NG

REPLACE RELAY (IG2-MAIN)
OK

5.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - IG2-MAIN RELAY)

(a) Disconnect the A60 hybrid vehicle control ECU connector.

(b) Remove the IG2-MAIN relay from the No. 1 engine room relay block.

*1

No. 1 Engine Room Relay Block

*2

IG2-MAIN Relay

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A60-3 (IG2) - Body ground

Power switch off

1 V or less

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(d) Install the IG2-MAIN relay.

(e) Reconnect the A60 hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems.

Click here

(1) Check the connection and terminal contact pressure of the connectors and wire harnesses between the hybrid vehicle control ECU and the No. 1 engine room relay block.

(2) When the power switch is on (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the No. 1 engine room relay block.

Problem symptom does not recur.

REPLACE HYBRID VEHICLE CONTROL ECU

Problem symptom recurs.

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

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