Inspection Procedure

INSPECT RADIO RECEIVER ASSY

Disconnect the radio receiver assy connector R2.
Measure the resistance according to the value (s) in the table below.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester connection	Condition	Specified condition
TX+ - TX-	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT )

Fig 1: Identifying Wire Harness Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go To Next Step.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT AMPLIFIER ASSY)

Disconnect the connector from the radio receiver assy R2 and stereo component amplifier assy S11*¹ , S18*² .
Measure the resistance according to the value (s) in the table below.

Standard:

MEASURING RESISTANCE CONDITION

Tester connection

Condition

Specified condition

TX+ (R2) - TX+ (S11⁽¹⁾, S18⁽²⁾)

Always

Below 1 Ω

TX- (R2) - TX- (S11⁽¹⁾, S18⁽²⁾)

Always

Below 1 Ω

TX+ (R2 or S11⁽¹⁾, S18⁽²⁾) - Body ground

Always

10 kΩ or higher

TX- (R2 or S11⁽¹⁾, S18⁽²⁾) - Body ground

Always

10 kΩ or higher

⁽¹⁾	Except Mark Levinson Models (6CD Type)

⁽²⁾	Mark Levinson Models

Fig 2: Identifying Wire Harness Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Locating Wire Harness

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Locating Wire Harness Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART

NOTE: The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the supplemental restraint system (see PRECAUTION ).

INSPECT RADIO RECEIVER ASSY

Disconnect the radio receiver assy connector.
Measure the resistance according to the value (s) in the table below.

Standard:

RESISTANCE CONDITION

Tester connection	Condition	Specified condition
SW1 - SWG	No switch is pushed	Approx. 100 kΩ
SW1 - SWG	SEEK+ switch: push	Approx. 0Ω
SW1 - SWG	SEEK- switch: push	Approx. 0.3 kΩ
SW1 - SWG	VOL+ switch: push	Approx. 1 kΩ
SW1 - SWG	VOL- switch: push	Approx. 3.2 kΩ
SW2 - SWG	No switch is pushed	Approx. 100 Ω
SW2 - SWG	MODE switch: push	Approx. 0 Ω

NG: Go to step 2

Fig 1: Locating Wire Harness Terminals

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

INSPECT STEERING PAD SWITCH ASSY

Fig 2: Steering Pad Switch Connector

Disconnect the steering pad switch assy connector.
Measure the resistance according to the value (s) in the table below

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester connection	Condition	Specified condition
AU1 - EAU	No switch is pushed	Approx. 100 kΩ
AU1 - EAU	SEEK+ switch: push	Approx. 0 Ω
AU1 - EAU	SEEK- switch: push	Approx. 0.3 Ω
AU1 - EAU	VOL+ switch: push	Approx. 1 kΩ
AU1 - EAU	VOL- switch: push	Approx. 3.2 kΩ
AU2 - EAU	No switch is pushed	Approx. 100 kΩ
AU2 - EAU	MODE switch: push	Approx. 0 Ω

NG: REPLACE STEERING PAD SWITCH ASSY (SEE STEERING PAD SWITCH LH )

OK: Go To Next Step.

INSPECT SPIRAL CABLE SUB-ASSY

Disconnect the steering pad switch assy and spiral cable sub-assy connectors.
Measure the resistance according to the value (s) in the table below.

Standard:

CHECKING RESISTANCE

Tester connection	Specified condition
EAU - EAU	Below 1 Ω
AU1 - AU1	Below 1 Ω
AU2 - AU2	Below 1 Ω

Fig 3: Inspecting Spiral Cable

NG: REPLACE SPIRAL CABLE SUB-ASSY (SEE SPIRAL CABLE SUB-ASSY )

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR