Lexus ES: Parking Assist ECU Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
Parking Assist ECU Communication Stop Mode | Any of the following conditions are met: | -
Parking assist ECU branch line or connector
-
Power source circuit of parking assist ECU
-
Parking assist ECU ground circuit
-
Parking assist ECU
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS LINES (PARKING ASSIST ECU BRANCH LINE) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the N44 parking assist ECU connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | N44-11 (CANH) - N44-12 (CANL) | Cable disconnected from negative (-) battery terminal | 54 to 69 Ω | | | *a | Front view of wire harness connector (to Parking Assist ECU) | | |
NG | | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (PARKING ASSIST ECU) |
OK | | |
2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | N44-4 (GND1) - Body ground | Cable disconnected from negative (-) battery terminal | Below 1 Ω | | | *a | Front view of wire harness connector (to Parking Assist ECU) | | |
(b) Reconnect the cable to the negative (-) battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
N44-1 (+B) - Body ground | Always | 11 to 14 V |
N44-2 (ACC) - Body ground | Engine switch on (ACC) | 11 to 14 V |
N44-3 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
OK | | REPLACE PARKING ASSIST ECU |
NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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